People's Bike Library of Portland (English Wikipedia)

Maus, Jonathan (June 1, 2009). "A monumental day for Zoobomb, and for Portland". BikePortland.org. Archived from the original on August 11, 2017. Retrieved December 22, 2017.
Maus, Jonathan (October 23, 2006). "Zoobombers ponder 'pyle' options". BikePortland.org. Archived from the original on August 29, 2013. Retrieved December 22, 2017.

books.google.com

Dalzell, Tom, ed. (2009). A Dictionary of Slang and Unconventional English. Taylor & Francis. p. 102. ISBN 978-0-415-37182-7. Archived from the original on December 23, 2017.
Smith, Julian (January 27, 2012). Frommer's Portland Day by Day. John Wiley & Sons. p. 33. ISBN 9781118222416. Archived from the original on December 23, 2017. Retrieved December 21, 2017.
Cook, Sybilla Avery (2013). Walking Portland, Oregon. Falcon Guides. Rowman & Littlefield. p. 61. ISBN 978-0762794119. Archived from the original on December 23, 2017.
McCollom, Hollyanna (2016). Moon Portland. Moon Publications / Avalon. p. 42. ISBN 978-1631212796. Archived from the original on December 23, 2017.
Roll, Todd (2014). Pedal Portland: 25 Easy Rides for Exploring the City by Bike. Timber Press. p. 41. ISBN 978-1-60469-602-8.
Weiss, Eben (2013). Bike Snob Abroad: Strange Customs, Incredible Fiets, and the Quest for Cycling Paradise. Chronicle Books. p. 55. ISBN 978-1-4521-0525-3.

cityrepair.org

Iserhott, Hinda (May 29, 2009). "Zoobomb Public Art Unveiling". City Repair Project. Archived from the original on October 19, 2014. Retrieved December 22, 2017.

culturenow.org

"People's Bike Library of Portland, 2009". cultureNOW. Archived from the original on October 18, 2014. Retrieved December 22, 2017.

portlandmercury.com

Mirk, Sarah (May 28, 2009). "Secret Sculpture Officially Cements Once-Fringe Zoobombers Into City". The Portland Mercury. Index Publishing. Archived from the original on September 6, 2015. Retrieved December 22, 2017.

publicartarchive.org

"Zoobomb Pyle, Portland, Oregon". Public Art Archive. Denver: Western States Arts Federation. Archived from the original on March 4, 2016. Retrieved June 20, 2023.

racc.org

"Public Art Search: People's Bike Library of Portland". Regional Arts & Culture Council. Archived from the original on December 23, 2017. Retrieved December 22, 2017.

web.archive.org

Maus, Jonathan (June 1, 2009). "A monumental day for Zoobomb, and for Portland". BikePortland.org. Archived from the original on August 11, 2017. Retrieved December 22, 2017.
Feldman, Lucy (July 20, 2014). "In Portland, Riders on Tiny Bikes Go 'Zoobombing'". The Wall Street Journal. News Corp (Dow Jones & Company). ISSN 0099-9660. OCLC 781541372. Archived from the original on August 31, 2017. Retrieved December 22, 2017.
Dalzell, Tom, ed. (2009). A Dictionary of Slang and Unconventional English. Taylor & Francis. p. 102. ISBN 978-0-415-37182-7. Archived from the original on December 23, 2017.
Mirk, Sarah (May 28, 2009). "Secret Sculpture Officially Cements Once-Fringe Zoobombers Into City". The Portland Mercury. Index Publishing. Archived from the original on September 6, 2015. Retrieved December 22, 2017.
Maus, Jonathan (October 23, 2006). "Zoobombers ponder 'pyle' options". BikePortland.org. Archived from the original on August 29, 2013. Retrieved December 22, 2017.
"Public Art Search: People's Bike Library of Portland". Regional Arts & Culture Council. Archived from the original on December 23, 2017. Retrieved December 22, 2017.
Iserhott, Hinda (May 29, 2009). "Zoobomb Public Art Unveiling". City Repair Project. Archived from the original on October 19, 2014. Retrieved December 22, 2017.
"Zoobomb Pyle, Portland, Oregon". Public Art Archive. Denver: Western States Arts Federation. Archived from the original on March 4, 2016. Retrieved June 20, 2023.
"People's Bike Library of Portland, 2009". cultureNOW. Archived from the original on October 18, 2014. Retrieved December 22, 2017.
Smith, Julian (January 27, 2012). Frommer's Portland Day by Day. John Wiley & Sons. p. 33. ISBN 9781118222416. Archived from the original on December 23, 2017. Retrieved December 21, 2017.
Cook, Sybilla Avery (2013). Walking Portland, Oregon. Falcon Guides. Rowman & Littlefield. p. 61. ISBN 978-0762794119. Archived from the original on December 23, 2017.
McCollom, Hollyanna (2016). Moon Portland. Moon Publications / Avalon. p. 42. ISBN 978-1631212796. Archived from the original on December 23, 2017.

worldcat.org

search.worldcat.org

Feldman, Lucy (July 20, 2014). "In Portland, Riders on Tiny Bikes Go 'Zoobombing'". The Wall Street Journal. News Corp (Dow Jones & Company). ISSN 0099-9660. OCLC 781541372. Archived from the original on August 31, 2017. Retrieved December 22, 2017.

wsj.com

Feldman, Lucy (July 20, 2014). "In Portland, Riders on Tiny Bikes Go 'Zoobombing'". The Wall Street Journal. News Corp (Dow Jones & Company). ISSN 0099-9660. OCLC 781541372. Archived from the original on August 31, 2017. Retrieved December 22, 2017.