Bender, Daniel E. (2016). The Animal Game: Searching for Wildness at the American Zoo. Cambridge, Massachusetts: Harvard University Press. pp. 45 (older animals), 55 (A.C. Robinson), 60 (Buck wife re jungle), 81 (fibs, fabricated), 84 (Buck brand name), 95–114 (Buck media career), 134–138 (fairs). doi:10.4159/9780674972759. ISBN978-0-674-97275-9. JSTORj.ctv253f7pm. LCCN2016017880. OCLC961185120. S2CID197858007.
Ancrenaz, M.; Gumal, M.; Marshall, A.J.; Meijaard, E.; Wich, S.A.; Husson, S. (2018) [errata version of 2016 assessment]. "Pongo pygmaeus". The IUCN Red List of Threatened Species. 2016. International Union for Conservation of Nature and Natural Resources. e.T17975A123809220. doi:10.2305/IUCN.UK.2016-1.RLTS.T17975A17966347.en. Retrieved 2022-11-20. ISSN2307-8235
Singleton, I.; Wich, S.A.; Nowak, M.; Usher, G.; Utami-Atmoko, S.S. (2018) [errata version of 2017 assessment]. "Pongo abelii". The IUCN Red List of Threatened Species. 2017. International Union for Conservation of Nature and Natural Resources. e.T121097935A123797627. doi:10.2305/iucn.uk.2017-3.rlts.t121097935a115575085.en. ISSN2307-8235.
Ancrenaz, M.; Gumal, M.; Marshall, A.J.; Meijaard, E.; Wich, S.A.; Husson, S. (2018) [errata version of 2016 assessment]. "Pongo pygmaeus". The IUCN Red List of Threatened Species. 2016. International Union for Conservation of Nature and Natural Resources. e.T17975A123809220. doi:10.2305/IUCN.UK.2016-1.RLTS.T17975A17966347.en. Retrieved 2022-11-20. ISSN2307-8235
Singleton, I.; Wich, S.A.; Nowak, M.; Usher, G.; Utami-Atmoko, S.S. (2018) [errata version of 2017 assessment]. "Pongo abelii". The IUCN Red List of Threatened Species. 2017. International Union for Conservation of Nature and Natural Resources. e.T121097935A123797627. doi:10.2305/iucn.uk.2017-3.rlts.t121097935a115575085.en. ISSN2307-8235.
Bender, Daniel E. (2016). The Animal Game: Searching for Wildness at the American Zoo. Cambridge, Massachusetts: Harvard University Press. pp. 45 (older animals), 55 (A.C. Robinson), 60 (Buck wife re jungle), 81 (fibs, fabricated), 84 (Buck brand name), 95–114 (Buck media career), 134–138 (fairs). doi:10.4159/9780674972759. ISBN978-0-674-97275-9. JSTORj.ctv253f7pm. LCCN2016017880. OCLC961185120. S2CID197858007.
Cribb, Robert B.; Gilbert, Helen; Tiffin, Helen (2014). "7: Orangutans on Stage and Screen". Wild Man from Borneo: A Cultural History of the Orangutan. Honolulu: University of Hawai'i Press. p. 171. ISBN978-0-8248-4026-6. JSTORj.ctt6wqz60. LCCN2013031367. OCLC878078682.
Bender, Daniel E. (2016). The Animal Game: Searching for Wildness at the American Zoo. Cambridge, Massachusetts: Harvard University Press. pp. 45 (older animals), 55 (A.C. Robinson), 60 (Buck wife re jungle), 81 (fibs, fabricated), 84 (Buck brand name), 95–114 (Buck media career), 134–138 (fairs). doi:10.4159/9780674972759. ISBN978-0-674-97275-9. JSTORj.ctv253f7pm. LCCN2016017880. OCLC961185120. S2CID197858007.
Cribb, Robert B.; Gilbert, Helen; Tiffin, Helen (2014). "7: Orangutans on Stage and Screen". Wild Man from Borneo: A Cultural History of the Orangutan. Honolulu: University of Hawai'i Press. p. 171. ISBN978-0-8248-4026-6. JSTORj.ctt6wqz60. LCCN2013031367. OCLC878078682.
Dick, Bernard F. (1997). "Chapter 2. The City Founder". City of Dreams: The Making and Remaking of Universal Pictures. Lexington: University Press of Kentucky. ISBN9780813120164. LCCN96040094. OCLC47011130.
Robeson, Dave (1935). "VI. ("Monkeys"); photo illustrations". Al G. Barnes, Master Showman, as told by Al G. Barnes. Caldwell, Idaho: The Caxton Printers, Ltd. pp. 88–105, 257. LCCN35012032. OCLC598387.
Braff, Richard E. (1999). The Universal silents: a filmography of the Universal Motion Picture Manufacturing Company, 1912–1929. Jefferson, North Carolina: McFarland. ISBN9780786402878. LCCN98003272. OCLC38738742.
Cary, Diana Serra (1996). Whatever happened to Baby Peggy? : the autobiography of Hollywood's pioneer child star. New York: St. Martin's Press. pp. 44–46 (deaths of Martin, Stecker, elephant), 335 (Life in Hollywood newsreel). ISBN0-312-14760-0. LCCN96023290. OCLC34772308.
Standiford, Les (2021). Battle for the Big Top: P.T. Barnum, James Bailey, John Ringling, and the Death-Defying Saga of the American Circus. New York. pp. 246–253, 258–261. ISBN978-1-5417-6228-2. LCCN2020056749. OCLC1199127731.{{cite book}}: CS1 maint: location missing publisher (link)
Bender, Daniel E. (2016). The Animal Game: Searching for Wildness at the American Zoo. Cambridge, Massachusetts: Harvard University Press. pp. 45 (older animals), 55 (A.C. Robinson), 60 (Buck wife re jungle), 81 (fibs, fabricated), 84 (Buck brand name), 95–114 (Buck media career), 134–138 (fairs). doi:10.4159/9780674972759. ISBN978-0-674-97275-9. JSTORj.ctv253f7pm. LCCN2016017880. OCLC961185120. S2CID197858007.
Lauritzen, Einar; Lundquist, Gunnar; Spehr, Paul; Dalton, Susan; Long, Derek. "Man and Beast". Early Cinema Titles, 1908–21. Media and Cinema Studies Department, University of Illinois at Urbana-Champaign. Retrieved 2022-11-23 – via ECHO (Early Cinema History Online).
Bender, Daniel E. (2016). The Animal Game: Searching for Wildness at the American Zoo. Cambridge, Massachusetts: Harvard University Press. pp. 45 (older animals), 55 (A.C. Robinson), 60 (Buck wife re jungle), 81 (fibs, fabricated), 84 (Buck brand name), 95–114 (Buck media career), 134–138 (fairs). doi:10.4159/9780674972759. ISBN978-0-674-97275-9. JSTORj.ctv253f7pm. LCCN2016017880. OCLC961185120. S2CID197858007.
Cribb, Robert B.; Gilbert, Helen; Tiffin, Helen (2014). "7: Orangutans on Stage and Screen". Wild Man from Borneo: A Cultural History of the Orangutan. Honolulu: University of Hawai'i Press. p. 171. ISBN978-0-8248-4026-6. JSTORj.ctt6wqz60. LCCN2013031367. OCLC878078682.
Dick, Bernard F. (1997). "Chapter 2. The City Founder". City of Dreams: The Making and Remaking of Universal Pictures. Lexington: University Press of Kentucky. ISBN9780813120164. LCCN96040094. OCLC47011130.
Singleton, I.; Wich, S.A.; Nowak, M.; Usher, G.; Utami-Atmoko, S.S. (2018) [errata version of 2017 assessment]. "Pongo abelii". The IUCN Red List of Threatened Species. 2017. International Union for Conservation of Nature and Natural Resources. e.T121097935A123797627. doi:10.2305/iucn.uk.2017-3.rlts.t121097935a115575085.en. ISSN2307-8235.
Robeson, Dave (1935). "VI. ("Monkeys"); photo illustrations". Al G. Barnes, Master Showman, as told by Al G. Barnes. Caldwell, Idaho: The Caxton Printers, Ltd. pp. 88–105, 257. LCCN35012032. OCLC598387.
Braff, Richard E. (1999). The Universal silents: a filmography of the Universal Motion Picture Manufacturing Company, 1912–1929. Jefferson, North Carolina: McFarland. ISBN9780786402878. LCCN98003272. OCLC38738742.
Reeder, Thomas (2021). Time is money! : the Century, Rainbow, and Stern Brothers comedies of Julius and Abe Stern. Orlando, Florida: BearManor Media. pp. 133–145 (Joe Martin, Mrs. Joe Martin, William Campbell, Harry Burns, Diana Cary memoir), 839–842 (Filmography appendix: Joe Martin comedies). ISBN9781629337982. OCLC1273678339.
Balducci, Anthony (2012). The Funny Parts: A History of Film Comedy Routines and Gags. Jefferson, North Carolina: McFarland. p. 46. ISBN9780786488933. OCLC768119702.
Cary, Diana Serra (1996). Whatever happened to Baby Peggy? : the autobiography of Hollywood's pioneer child star. New York: St. Martin's Press. pp. 44–46 (deaths of Martin, Stecker, elephant), 335 (Life in Hollywood newsreel). ISBN0-312-14760-0. LCCN96023290. OCLC34772308.
Snyder, Sherri (2017). "18". Barbara La Marr: The Girl Who Was Too Beautiful for Hollywood. University Press of Kentucky. ISBN9780813174259. OCLC974454308.
Soares, André (2010). Beyond Paradise: The Life of Ramon Novarro. University Press of Mississippi. p. 34. ISBN978-1-60473-458-4. OCLC1298206162.
Standiford, Les (2021). Battle for the Big Top: P.T. Barnum, James Bailey, John Ringling, and the Death-Defying Saga of the American Circus. New York. pp. 246–253, 258–261. ISBN978-1-5417-6228-2. LCCN2020056749. OCLC1199127731.{{cite book}}: CS1 maint: location missing publisher (link)
Ancrenaz, M.; Gumal, M.; Marshall, A.J.; Meijaard, E.; Wich, S.A.; Husson, S. (2018) [errata version of 2016 assessment]. "Pongo pygmaeus". The IUCN Red List of Threatened Species. 2016. International Union for Conservation of Nature and Natural Resources. e.T17975A123809220. doi:10.2305/IUCN.UK.2016-1.RLTS.T17975A17966347.en. Retrieved 2022-11-20. ISSN2307-8235