"Thomas R. Defler". Retrieved 2012-08-17. http://www.thomasdefler.com/resume.html
"Thomas R. Defler". Retrieved 2012-08-17. http://www.thomasdefler.com/resume.html
Defler, T. (2004). Primates of Colombia. Conservation International. ISBN 978-1-881173-83-0. 978-1-881173-83-0
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"Thomas R. Defler". Retrieved 2012-08-17. http://www.thomasdefler.com/resume.html
Defler, T. (2004). Primates of Colombia. Conservation International. ISBN 978-1-881173-83-0. 978-1-881173-83-0
Defler, Thonas; Stevenson, Pablo, eds. (2014). The Woolly Monkey: Behavior, Ecology, Systematics, and Captive Research (Developments in Primatology: Progress and Prospects). Springer. ISBN 9781493906963. 9781493906963
Defler, Thomas R.; Bueno, Marta L. (2008). "Aotus diversity and the species problem". Primate Conservation. 22 (1): 55. doi:10.1896/052.022.0104. 136211. https://doi.org/10.1896%2F052.022.0104
Defler, Thomas R.; Bueno, Marta; Garcia, Javier (2010). "Callicebus caquetensis: A new and critically endangered titi monkey from Southern Caquetá, Colombia". Primate Conservation. 25: 1–9. doi:10.1896/052.025.0101. S2CID 83583912. 136211. https://doi.org/10.1896%2F052.025.0101
"Newly discovered monkey nearly extinct". NTDTV. Archived from the original on 2013-04-15. Retrieved 2012-08-17. https://archive.today/20130415111908/http://ntdtv.org/en/news_southamerica/2010-08-30/937057835941.html
Moseman, A. (August 13, 2010). "Rare Redbearded Monkeys Found Living in Colombia". CBS News. Retrieved 2012-08-17. https://www.cbsnews.com/news/rare-redbearded-monkeys-found-living-in-colombia/
Defler, T. (2004). Primates of Colombia. Conservation International. pp. 252–266. ISBN 978-1-881173-83-0. 978-1-881173-83-0