Unidentified flying object (English Wikipedia)

Dini, Luc (January 10, 2013). "Sigma 2". 3AF. Paris: Association Aéronautique et Astronautique de France. Archived from the original on February 13, 2014. Retrieved January 11, 2014.

academia.edu

Project Blue Book Special Report 14: Analysis of Reports of Unidentified Aerial Objects (Report). United States Air Force. May 5, 1955. p. 10. Archive.

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"Home > Visit > Museum Exhibits > Fact Sheets > Display Avro Canada VZ-9AV Avrocar". www.nationalmuseum.af.mil United States Air Force. October 9, 2015. Archived from the original on May 18, 2021. Retrieved June 22, 2021.

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"The truth is out there: Britons 'spotted' UFOs, records say". London. AFP. May 13, 2008. Archived from the original on June 5, 2013. Retrieved May 16, 2013.

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Eghigian, Greg. "That Secret Government Program to Track UFOs? It's Not the First". Air & Space Magazine. Archived from the original on March 18, 2020. Retrieved March 21, 2018.

americanchronicle.com

Giordano, Daniela (November 13, 2006). "Do UFOs Exist in the History of Arts?". American Chronicle. Ultio, LLC. Archived from the original on August 19, 2012. Retrieved September 6, 2013.
Booth, B J (December 8, 2008). "Before the Wright Brothers ... There Were UFOs". American Chronicle. Ultio, LLC. Archived from the original on August 19, 2012. Retrieved September 6, 2013.

antoniolombatti.it

Shermer, Michael (2002). Shermer, Michael (ed.). The Skeptic Encyclopedia of Pseudoscience (PDF). ABC–CLIO, Inc. ISBN 978-1-57607-653-8. Archived from the original (PDF) on August 11, 2016. Retrieved December 16, 2013.

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Merchant, Nomaan (June 25, 2021). "No ET, no answers: Intel report is inconclusive about UFOs". apnews.com. Associated Press. Archived from the original on June 25, 2021. Retrieved June 25, 2021.

archive.org

Swords & Powell 2012, p. 63 Swords, Michael; Powell, Robert; et al. (2012). UFOs and Government: A Historical Inquiry. San Antonio, TX: Anomalist Books. ISBN 978-1-933665-58-0. OCLC 809977863.
Keyhoe, Donald E. (1973). Aliens from space; the real story of unidentified flying objects. Garden City, New York: Doubleday. ISBN 0-385-06751-8.
"Project Blue Book Special Report #14". Internet Archive. United States Air Force. Retrieved September 7, 2013.
Hynek 1972, p. 76 Hynek, J. Allen (1972). The UFO Experience: A Scientific Inquiry. Chicago: Henry Regnery Company. LCCN 76183827. OCLC 341112.
McDonald, James E. (1974) [Originally published 1972]. "Science in Default: Twenty-Two Years of Inadequate UFO Investigations". In Sagan, Carl; Page, Thornton (eds.). UFO's: A Scientific Debate. American Association for the Advancement of Science, 134th Meeting (Reprint ed.). New York: W. W. Norton & Company. ISBN 978-0-393-00739-8. LCCN 72004572. OCLC 934695. Retrieved March 30, 2011.
Vallée 2008 Vallée, Jacques (2008) [Originally published 1991; New York: Ballantine Books]. Revelations: Alien Contact and Human Deception. San Antonio, TX: Anomalist Books. ISBN 978-1-933665-30-6. LCCN 91091858. OCLC 225866107.
Menzel & Taves 1977 Menzel, Donald H.; Taves, Ernest H. (1977). The UFO Enigma: The Definitive Explanation of the UFO Phenomenon. Introduction by Fred L. Whipple. Garden City, NY: Doubleday. ISBN 0-385-03596-9. LCCN 76016255. OCLC 2597609.
Swords & Powell 2012, pp. 306–332 Swords, Michael; Powell, Robert; et al. (2012). UFOs and Government: A Historical Inquiry. San Antonio, TX: Anomalist Books. ISBN 978-1-933665-58-0. OCLC 809977863.
Feist, Gregory J. (2006). The psychology of science and the origins of the scientific mind. Yale University Press. p. 219. ISBN 0-300-11074-X.
Restivo, Sal P. (2005). Science, technology, and society: an encyclopedia. Oxford University Press US. p. 176. ISBN 0-19-514193-8.
Fawcett & Greenwood, 81–89; Good 1988, pp. 318–322, 497–502 Good, Timothy (1988). Above Top Secret: The Worldwide UFO Cover-Up. Foreword by Lord Hill-Norton (1st Quill ed.). New York: William Morrow and Company. ISBN 0-688-09202-0. LCCN 88208434. OCLC 707516815. Many UFO documents.
Good 1988, pp. 371–373 Good, Timothy (1988). Above Top Secret: The Worldwide UFO Cover-Up. Foreword by Lord Hill-Norton (1st Quill ed.). New York: William Morrow and Company. ISBN 0-688-09202-0. LCCN 88208434. OCLC 707516815. Many UFO documents.
Jacobs 2000, Chapter: "UFOs: Lost in the Myths" by Thomas E. Bullard, p. 141 Jacobs, David M., ed. (2000). UFOs and Abductions: Challenging the Borders of Knowledge. Lawrence: University Press of Kansas. ISBN 0-7006-1032-4. LCCN 00028970. OCLC 43615835.
Jacobs 2000, Chapter: "UFOs, the Military, and the Early Cold War Era" by Michael D. Swords, pp. 82–121 Jacobs, David M., ed. (2000). UFOs and Abductions: Challenging the Borders of Knowledge. Lawrence: University Press of Kansas. ISBN 0-7006-1032-4. LCCN 00028970. OCLC 43615835.

archive.today

Chang, Kenneth (September 14, 2023). "NASA Introduces New U.F.O. Research Director – The role was created in response to the recommendations of a report that found the agency could do more to collect and interpret data on unidentified anomalous phenomena". The New York Times. Archived from the original on September 14, 2023. Retrieved September 15, 2023.

astrosociety.org

Fraknoi, Andrew (October 2009). "The 'Great Moon Hoax': Did Astronauts Land on the Moon?". Astronomical Pseudo-Science: A Skeptic's Resource List. Astronomical Society of the Pacific. Retrieved November 2, 2011.

atlasobscura.com

"The 1980s Book Series That Literally Claimed It Had To Be Read To Be Believed". Atlas Obscura. September 22, 2015. Archived from the original on July 4, 2024. Retrieved July 9, 2023.

bbc.co.uk

news.bbc.co.uk

"Files released on UFO sightings". BBC News. London: BBC. May 14, 2008. Archived from the original on July 20, 2008. Retrieved May 16, 2013.
"Airliner had near miss with UFO". BBC News. London: BBC. October 20, 2008. Archived from the original on October 23, 2008. Retrieved May 16, 2013.
Watson, Rob (May 10, 2001). "UFO spotters slam 'US cover-up'". BBC News. London: BBC. Archived from the original on July 23, 2019. Retrieved September 11, 2013.

bbc.com

"Brazil to record UFO sightings". BBC News. August 12, 2010. Archived from the original on May 4, 2018. Retrieved April 1, 2018.
"UFO report: US finds no explanation for sightings". BBC News. June 25, 2021. Archived from the original on July 6, 2021. Retrieved July 4, 2021.

bco.ie

"How To Identify A UFO". MTU Blackrock Castle. August 15, 2022. Retrieved September 14, 2024.

books.google.com

Kuenzle, Dominique (2017). "Towards a New Epistemology 1.2 Second development: Naturalising Epistemology Stroud's objection". Written at University of Zurich. Refurbishing Epistemology A Meta-Epistemological Framework. Epistemic Studies Philosophy of Science, Cognition and Mind. Berlin, Boston: De Gruyter (published June 26, 2017). p. 22. ISBN 9783110525458. ISSN 2512-5168. Retrieved March 18, 2025 – via Google Books.
Robertson, David G. (2016). "Introduction: Aquarian conspiracies". Written at Open University. UFOs, Conspiracy Theories and the New Age Millennial Conspiracism. BLOOMSBURY ADVANCES IN RELIGIOUS STUDIES (1 ed.). LONDON OXFORD NEW YORK NEW DELHI SYDNEY: Bloomsbury Academic. p. 9. ISBN 9781350044982. Retrieved March 18, 2025 – via Google Books.
Vallee, Jacques; Aubeck, Chris (2010). Wonders in the Sky: Unexplained Aerial Objects from Antiquity to Modern Times. Tarcher. ISBN 978-1585428205.
Borchert (2013). The book of miracles: Facsimile of the Augsburg manuscript from the Collection of Mickey Cartin (in German). Taschen. ISBN 978-3-8365-4285-2. Archived from the original on July 30, 2023. Retrieved July 8, 2024.
Andresen, Jensine; Torres, Octavio A. Chon (2022). Extraterrestrial Intelligence: Academic and Societal Implications. Cambridge Scholars Publishing. ISBN 978-1-5275-7925-5.

bostonreview.net

Eghigian, Greg (August 4, 2021). "UFOs and the Boundaries of Science". Boston Review. Archived from the original on April 10, 2023. Retrieved June 19, 2023.

br.de

"Deutschlandweit einmalig – Ufo-Forschung an der Uni Würzburg". BR24 (in German). September 3, 2021. Retrieved January 28, 2022.

cbsnews.com

Binlot, Ann (August 5, 2010). "Winston Churchill Ordered UFO Coverup?". cbsnews.com. CBS news. Archived from the original on November 10, 2021. Retrieved November 10, 2021.
video. "Navy pilots describe encounters with UFOs". CBS News. Archived from the original on May 19, 2021. Retrieved May 19, 2021.

chedd-angier.com

""Beyond Science", on season 8, episode 2". Scientific American Frontiers. Chedd-Angier Production Company. 1997–1998. PBS. Archived from the original on January 1, 2006.

cia.gov

Haines, Gerald K. (1997). "A Die-Hard Issue: CIA's Role in the Study of UFOs, 1947–90" (PDF). Studies in Intelligence. 1 (1): 67–84. Archived (PDF) from the original on February 12, 2024. Retrieved July 8, 2023.
Haines, Gerald K. (1997). "CIA's Role in the Study of UFOs, 1947–90". Central Intelligence Agency. OCLC 713270503. Archived from the original on October 1, 2019. Retrieved July 13, 2013.

citizenhearing.org

"Citizen Hearing on Disclosure". Citizen Hearing on Disclosure. Bethesda, MD: Paradigm Research Group. Archived from the original on September 15, 2013. Retrieved September 11, 2013.

cnes-geipan.fr

United States Air Force (1968). Aid to Identification of Flying Objects (PDF) (Report). U.S. Government Printing Office.
"GEIPAN: Le GEIPAN". Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non Identifiés (GEIPAN). Paris: Centre national d'études spatiales (CNES). Archived from the original on February 19, 2011. Retrieved May 16, 2013.

cnes.fr

"A history of UAP research at CNES". CNES. Archived from the original on October 6, 2014. Retrieved October 6, 2014.
"CNES report, March 26, 2007". April 23, 2015. Archived from the original on January 8, 2023. Retrieved January 8, 2023.

cnn.com

edition.cnn.com

Hunt, Katie; Strickland, Ashley. "NASA is assembling a team to gather data on unidentifiable events in the sky". CNN. Retrieved July 4, 2022.
Symington, Fife (November 9, 2007). "Symington: I saw a UFO in the Arizona sky". CNN. Atlanta, GA: Turner Broadcasting System. Archived from the original on October 20, 2013. Retrieved November 25, 2013.
Chandelis Duster. "Defense Department confirms leaked video of unidentified aerial phenomena is real". CNN. Archived from the original on April 16, 2021. Retrieved April 16, 2021.

cnn.com

"Poll: U.S. hiding knowledge of aliens". CNN. Atlanta, GA: Turner Broadcasting System. June 15, 1997. Archived from the original on October 17, 2013. Retrieved September 12, 2013.

collectionscanada.gc.ca

"Canada's UFOs: The Search for the Unknown" (Virtual museum). Ottawa: Library and Archives Canada. Archived from the original on January 16, 2016. Retrieved September 8, 2013.

congress.gov

"House Oversight Committee Hearing on UAPs" (PDF). November 2024. Retrieved November 13, 2024.

cornell.edu

law.cornell.edu

"50 U.S. Code § 3373 – Establishment of All-domain Anomaly Resolution Office". law.cornell.edu. LII / Legal Information Institute. Archived from the original on May 20, 2024. Retrieved March 21, 2024.

cufon.org

"Introductory Space Science". CUFON.org. West Jacksonville, FL: Computer UFO Network (CUFON). Archived from the original on May 30, 2013. Retrieved May 16, 2013. Air Force Academy UFO material.

cufos.org

"Center for UFO Studies". CUFOS.org. Chicago: Center for UFO Studies. Archived from the original on October 21, 1997. Retrieved July 13, 2013.

dailyemerald.com

Schmidt, Brad (April 25, 2002). "Alien theorist offers proof of government coverup". Oregon Daily Emerald. Eugene, OR. Archived from the original on August 14, 2012. Retrieved December 12, 2012.

dailymotion.com

"Ovni-nouvelle-commission-denquete-3AF-PAN (Partie 1)". Dailymotion. Paris: Orange. May 11, 2009. Archived from the original on January 6, 2014. Retrieved January 11, 2014.

defense.gov

media.defense.gov

Kathleen Hicks (23 November 2021) Establishment of the Airborne Object Identification and Management Synchronization Group Archived May 23, 2023, at the Wayback Machine

defense.gov

Vergun, David (April 19, 2023). "DOD Working to Better Understand, Resolve Anomalous Phenomena". DOD News. Archived from the original on June 13, 2023. Retrieved June 13, 2023.

defensescoop.com

Vincent, Brandi (July 25, 2023). "Senators aim to set a mandatory timeline and process for agencies to declassify all UAP records". Defense Scoop. Archived from the original on December 8, 2023. Retrieved September 13, 2024.

detroitnews.com

Schultz, Marisa (April 29, 2013). "Ex-Rep. Kilpatrick 'waiting to hear' evidence of space aliens". The Detroit News. MediaNews Group. Archived from the original on May 31, 2013. Retrieved September 11, 2013.

dgac.gob.cl

sefaa.dgac.gob.cl

"Origen de la SEFAA". SEFAA. Santiago de Chile. Archived from the original on July 4, 2022. Retrieved July 3, 2022.(in spanish)

digitaljournal.com

Dearing, Stephanie (December 5, 2009). "Cost-cutting causes British gov't to shut down UFO investigations". Digital Journal. Toronto. Archived from the original on May 15, 2013. Retrieved May 16, 2013.

dni.gov

"Preliminary Assessment: Unidentified Aerial Phenomena" (PDF). Office of the Director of National Intelligence. June 25, 2021. Archived (PDF) from the original on July 26, 2021. Retrieved June 25, 2021.
"Preliminary Assessment: Unidentified Aerial Phenomena" (PDF). Office of the Director of National Intelligence. June 25, 2021. Archived (PDF) from the original on July 26, 2021. Retrieved June 26, 2021.

doi.org

Sparks, Glenn G.; Pellechia, Marianne; Irvine, Chris (June 1998). "Does television news about UFOs affect viewers' UFO beliefs?: An experimental investigation". Communication Quarterly. 46 (3): 284–294. doi:10.1080/01463379809370102. ISSN 0146-3373. Archived from the original on July 9, 2023. Retrieved July 8, 2024.
Kripal, Jeffrey J. (2010). Authors of the Impossible. University of Chicago Press. doi:10.7208/chicago/9780226453897.001.0001. ISBN 978-0-226-45387-3. Archived from the original on July 8, 2024. Retrieved July 8, 2024.
Davison, Andrew (October 2, 2019). "Astrotheology: Science and Theology Meet Extraterrestrial Life". Theology and Science. 17 (4): 551–554. doi:10.1080/14746700.2019.1670968. ISSN 1474-6700. S2CID 211965883. Archived from the original on July 8, 2024. Retrieved July 8, 2024.
Cusack, Carole M. (2019). "D. W. Pasulka, American Cosmic: UFOs, Religion, Technology". Alternative Spirituality and Religion Review. 10 (2): 258–259. doi:10.5840/asrr201910263. ISSN 1946-0538. S2CID 213855394. Archived from the original on July 8, 2024. Retrieved July 8, 2024.
Cross, Anne (March 2004). "The Flexibility of Scientific Rhetoric: A Case Study of UFO Researchers". Qualitative Sociology. 27 (1). Springer: 3–34. doi:10.1023/B:QUAS.0000015542.28438.41. ISSN 0162-0436. S2CID 144197172.
Eghigian, Greg (December 6, 2015). "Making UFOs make sense: Ufology, science, and the history of their mutual mistrust". Public Understanding of Science. 26 (5): 612–626. doi:10.1177/0963662515617706. PMID 26644010. S2CID 37769406.
Dodd, Adam (April 27, 2018). "Strategic Ignorance and the Search for Extraterrestrial Intelligence: Critiquing the Discursive Segregation of UFOs from Scientific Inquiry". Astropolitics. 16 (1): 75–95. Bibcode:2018AstPo..16...75D. doi:10.1080/14777622.2018.1433409. ISSN 1477-7622. S2CID 148687469.
Partridge, Christopher (July 2004). "Alien demonology: The Christian roots of the malevolent extraterrestrial in UFO religions and abduction spiritualities". Religion. 34 (3): 163–189. doi:10.1016/j.religion.2004.04.014. ISSN 0048-721X. Archived from the original on July 8, 2024. Retrieved June 13, 2024.

dx.doi.org

Kripal, Jeffrey J. (2010). Authors of the Impossible. University of Chicago Press. doi:10.7208/chicago/9780226453897.001.0001. ISBN 978-0-226-45387-3. Archived from the original on July 8, 2024. Retrieved July 8, 2024.
Davison, Andrew (October 2, 2019). "Astrotheology: Science and Theology Meet Extraterrestrial Life". Theology and Science. 17 (4): 551–554. doi:10.1080/14746700.2019.1670968. ISSN 1474-6700. S2CID 211965883. Archived from the original on July 8, 2024. Retrieved July 8, 2024.
Cusack, Carole M. (2019). "D. W. Pasulka, American Cosmic: UFOs, Religion, Technology". Alternative Spirituality and Religion Review. 10 (2): 258–259. doi:10.5840/asrr201910263. ISSN 1946-0538. S2CID 213855394. Archived from the original on July 8, 2024. Retrieved July 8, 2024.

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Isgleas, Daniel (June 7, 2009). "Hay aún 40 casos de ovnis sin explicación". El País (in Spanish). Montevideo: Teledoce. Archived from the original on November 16, 2013. Retrieved September 10, 2013.

excite.com

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Contreras, Russell (March 29, 2013). "FBI 'flying saucers' NM memo bureau's most viewed". Associated Press. Archived from the original on September 27, 2013. Retrieved April 1, 2013.

fbi.gov

foia.fbi.gov

Many of these documents are now online at the FOIA websites of these agencies such as the "FBI FOIA site". Archived from the original on May 24, 2008., as well as private websites such as The Black Vault Archived September 2, 2011, at the Wayback Machine, which has an archive of several thousand U.S. government UFO-related documents from the USAF, Army, CIA, DIA, DOD, and NSA.

foxnews.com

Kehnemui, Sharon (May 10, 2001). "Men in Suits See Aliens as Part of Solution, Not Problem". FoxNews.com. New York: Fox Entertainment Group. Archived from the original on August 25, 2013. Retrieved May 10, 2007.

futurism.com

"Pentagon Confirms That Leaked Video Is Part of UFO Investigation". Futurism. April 11, 2021. Archived from the original on May 15, 2021. Retrieved April 16, 2021.
"Pentagon Confirms That Leaked Video Is Part of UFO Investigation". Futurism. April 11, 2021. Archived from the original on May 15, 2021. Retrieved April 16, 2021.

galaksija.com

Keel 1996, pp. 29–31, stating date of April 22, 1897 Keel, John (1996) [Originally published 1970 as UFOs: Operation Trojan Horse; New York: G. P. Putnam's Sons]. Operation Trojan Horse (PDF). Lilburn, GA: IllumiNet Press. ISBN 978-0-9626534-6-9. LCCN 96014564. OCLC 34474485. Archived from the original (PDF) on April 20, 2013.

gallup.com

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Saad, Lydia (April 12, 2016). "Gallup Vault: Eyewitnesses to Flying Saucers". Gallup. Archived from the original on May 23, 2023. Retrieved July 8, 2023.
Saad, Lydia (August 20, 2021). "Larger Minority in U.S. Says Some UFOs Are Alien Spacecraft". Gallup. Archived from the original on May 23, 2023. Retrieved June 19, 2023.
"Larger Minority in U.S. Says Some UFOs Are Alien Spacecraft". Gallup.com. August 20, 2021. Retrieved September 13, 2022.

geipan.fr

"Autres Liens". Archived from the original on August 4, 2023. Retrieved October 6, 2014.

ghostarchive.org

Hough, Andrew (April 13, 2010). "UFO studies should be 'legitimate university subject', claims American professor". The Daily Telegraph. London. Archived from the original on January 11, 2022. Retrieved July 13, 2013.
Baynes, Chris (September 21, 2019). "Storm Area 51: Hundreds of people gather at US military base to 'see them aliens'". The Independent. Archived from the original on May 25, 2022. Retrieved September 23, 2019.

go.com

abcnews.go.com

Harish, Alon (June 27, 2012). "UFOs Exist, Say 36 Percent in National Geographic Survey". ABC News. Archived from the original on June 9, 2023. Retrieved June 19, 2023.
Raymer, Katelynn; Ruppe, David (May 10, 2001). "Group Calls for Disclosure of UFO Info". ABC News. Archived from the original on July 28, 2013. Retrieved March 11, 2013.

govinfo.gov

2022 Congressional Record, Vol. 168, Page D545 (May 17, 2022)

gpposner.com

Posner, Gary P. (July 1992). "The Gulf Breeze 'UFOs'". Tampa Bay Sounding. Seminole, FL: Tampa Bay Mensa. Archived from the original on July 3, 2013. Retrieved July 13, 2013.

gutenberg.org

"Federal Bureau of Investigation FOIA Documents – Unidentified Flying Objects". Project Gutenberg. Archived from the original on November 10, 2012. Retrieved September 7, 2013. Internal FBI memo from E. G. Fitch to D. M. Ladd concerning a request by General George F. Schulgen, Chief of the Requirements Intelligence Branch of Army Air Corps Intelligence, for the FBI to help with their investigation of UFO reports.

haaan.com

magonia.haaan.com

Martin S. Kottmeyer, Magonia #90; November 2005, pp. 3–15. "Engine Stoppers Archived 2013-10-01 at the Wayback Machine"

harvard.edu

adsabs.harvard.edu

Andrew Fraknoi, Science Education and Outreach: Forging a Path to the Future Archived May 26, 2021, at the Wayback Machine. Proceedings of a conference held September 12–16, 2009 in Millbrae, California. Edited by Jonathan Barnes, Denise A. Smith, Michael G. Gibbs, and James G. Manning., p. 514, August 2010

ui.adsabs.harvard.edu

Dodd, Adam (April 27, 2018). "Strategic Ignorance and the Search for Extraterrestrial Intelligence: Critiquing the Discursive Segregation of UFOs from Scientific Inquiry". Astropolitics. 16 (1): 75–95. Bibcode:2018AstPo..16...75D. doi:10.1080/14777622.2018.1433409. ISSN 1477-7622. S2CID 148687469.

projects.iq.harvard.edu

"Public Announcement". projects.iq.harvard.edu. Archived from the original on August 12, 2021. Retrieved August 13, 2021.

historians.org

Eghigian, Greg (March 14, 2017). "More Human Than Alien: Researvching the History of UFOs". Perspectives on History. Archived from the original on June 21, 2023. Retrieved July 8, 2023.

huffingtonpost.com

Speigel, Lee (August 26, 2011). "UFO Sightings Increase 67 Percent In 3 Years, History Channel Investigates Unexplained Aerial Phenomena". The Huffington Post. AOL. Archived from the original on September 9, 2013. Retrieved July 13, 2013.

iacad.org

"Statement of the position of the Iowa Academy of Science on Pseudoscience" (PDF). Iowa Academy of Science. July 1986. Archived from the original (PDF) on June 26, 2007.

independent.co.uk

"UFO hotspots revealed as ex Ministry of Defence expert calls for action". The Independent. October 24, 2023. Archived from the original on November 4, 2023. Retrieved November 16, 2023.
Kelvey, Jon (June 10, 2022). "Nasa UFO study to focus on gathering data, not making conclusions". The Independent. Retrieved July 4, 2022.
"Pentagon confirms leaked video of UFO 'buzzing' Navy warships is genuine". The Independent. April 13, 2021. Archived from the original on May 15, 2021. Retrieved April 16, 2021.
Griffin, Andrew (July 17, 2019). "Storm Area 51: Are Alien-hunters Really Planning to 'Raid' the Secret U.S. Military Base?". The Independent. Archived from the original on July 16, 2019. Retrieved July 3, 2021.
Baynes, Chris (September 21, 2019). "Storm Area 51: Hundreds of people gather at US military base to 'see them aliens'". The Independent. Archived from the original on May 25, 2022. Retrieved September 23, 2019.

intelligence.gov

"Unidentified Aerial Phenomena. Preliminary Intelligence Assessment". www.intelligence.gov. Office of the Director of National Intelligence. Retrieved March 22, 2025.

issues.org

Kloor, Kieth (April 3, 2019). "UFOs Won't Go Away". Issues. Vol. XXXV, No. 3, Spring 2019. Arizona State University. Archived from the original on November 8, 2021. Retrieved November 8, 2021.

jasoncolavito.com

Colavito, Jason (December 12, 2012). "The UFO Battle over Nuremburg". jasoncolavito.com. Archived from the original on December 20, 2012. Retrieved July 12, 2013.

kens5.com

Wright, Aaron (October 31, 2018). "'The truth is out there': UFO group debunks hoaxes in hopes of finding the real thing". kens5.com. Retrieved September 14, 2024.

latimes.com

Guthrie, Dillon (December 16, 2021). "Op-Ed: OK! It's time to take UFOs seriously". Los Angeles Times. Archived from the original on December 16, 2021. Retrieved December 16, 2021.

livescience.com

Carey, Bjorn; Melina, Remy (November 10, 2010). "7 Things Most Often Mistaken for UFOs". Live Science. Retrieved September 14, 2024.

loc.gov

lccn.loc.gov

Ruppelt 1956, Chapter 1: "Project Blue Book and the UFO Story" Archived September 27, 2013, at the Wayback Machine Ruppelt, Edward J. (1956). The Report on Unidentified Flying Objects. Garden City, NY: Doubleday & Company, Inc. LCCN 56005444. OCLC 1941793. Archived from the original on May 16, 2011. Retrieved August 28, 2004. A UFO classic by insider Ruppelt, the first head of the USAF Project Blue Book.
Armando Simón "The Zeitgeist of the UFO Phenomenon". Haines ed. 1979 Haines, Richard F., ed. (1979). UFO Phenomena and the Behavioral Scientist. Metuchen, NJ: Scarecrow Press. ISBN 0-8108-1228-2. LCCN 79014878. OCLC 5008381.
Giere, Ronald N.; Bickle, John; Mauldin, Robert F. (2006), Understanding Scientific Reasoning (5th ed.), Wadsworth Publishing, p. 99, ISBN 0-15-506326-X, LCCN 2005922853, OCLC 61369793
Hendry 1979 Hendry, Allan (1979). The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings. Foreword by J. Allen Hynek. Garden City, NY: Doubleday. ISBN 0-385-14348-6. LCCN 78008211. OCLC 4642190. Skeptical but balanced analysis of 1300 CUFOS UFO cases.
Keel 1996, pp. 29–31, stating date of April 22, 1897 Keel, John (1996) [Originally published 1970 as UFOs: Operation Trojan Horse; New York: G. P. Putnam's Sons]. Operation Trojan Horse (PDF). Lilburn, GA: IllumiNet Press. ISBN 978-0-9626534-6-9. LCCN 96014564. OCLC 34474485. Archived from the original (PDF) on April 20, 2013.
Ruppelt 1956, Chapter 3: "The Classics" Archived September 6, 2007, at the Wayback Machine Ruppelt, Edward J. (1956). The Report on Unidentified Flying Objects. Garden City, NY: Doubleday & Company, Inc. LCCN 56005444. OCLC 1941793. Archived from the original on May 16, 2011. Retrieved August 28, 2004. A UFO classic by insider Ruppelt, the first head of the USAF Project Blue Book.
Hynek 1972, p. 76 Hynek, J. Allen (1972). The UFO Experience: A Scientific Inquiry. Chicago: Henry Regnery Company. LCCN 76183827. OCLC 341112.
McDonald, James E. (1974) [Originally published 1972]. "Science in Default: Twenty-Two Years of Inadequate UFO Investigations". In Sagan, Carl; Page, Thornton (eds.). UFO's: A Scientific Debate. American Association for the Advancement of Science, 134th Meeting (Reprint ed.). New York: W. W. Norton & Company. ISBN 978-0-393-00739-8. LCCN 72004572. OCLC 934695. Retrieved March 30, 2011.
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Sagan, Carl (1995). The Demon-Haunted World: Science as a Candle in the Dark. New York: Random House. ISBN 0-394-53512-X. LCCN 95034076. OCLC 779687822.
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Good 1988, pp. 371–373 Good, Timothy (1988). Above Top Secret: The Worldwide UFO Cover-Up. Foreword by Lord Hill-Norton (1st Quill ed.). New York: William Morrow and Company. ISBN 0-688-09202-0. LCCN 88208434. OCLC 707516815. Many UFO documents.
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Ruppelt 1956 Ruppelt, Edward J. (1956). The Report on Unidentified Flying Objects. Garden City, NY: Doubleday & Company, Inc. LCCN 56005444. OCLC 1941793. Archived from the original on May 16, 2011. Retrieved August 28, 2004. A UFO classic by insider Ruppelt, the first head of the USAF Project Blue Book.

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Many of these documents are now online at the FOIA websites of these agencies such as the "FBI FOIA site". Archived from the original on May 24, 2008., as well as private websites such as The Black Vault Archived September 2, 2011, at the Wayback Machine, which has an archive of several thousand U.S. government UFO-related documents from the USAF, Army, CIA, DIA, DOD, and NSA.
The so-called Twining memo of September 23, 1947 Archived February 26, 2009, at the Wayback Machine, by future USAF Chief of Staff, General Nathan Twining, specifically recommended intelligence cooperation with the Army, Navy, Atomic Energy Commission, the Defense Department's Joint Research and Development Board, Air Force Scientific Advisory Board, National Advisory Committee for Aeronautics (NACA), Project RAND, and the Nuclear Energy for the Propulsion of Aircraft (NEPA) project.
For example, current USAF general reporting procedures are in Air Force Instruction (AFI)10-206 Archived June 18, 2008, at the Wayback Machine. Section 5.7.3 (p. 64) lists sightings of "unidentified flying objects" and "aircraft of unconventional design" as separate categories from potentially hostile but conventional, unidentified aircraft, missiles, surface vessels, or submarines. Additionally, "unidentified objects" detected by missile warning systems, creating a potential risk of nuclear war, are covered by Rule 5E (p.35).
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