1 Bajic, P, Selmen SH, and Rhees MA. "Voronoff to Virion: 1920s Testis Transplantation and AIDS." NCBI. October 23, 2012. accessed: May 22, 2017.
2 Bengsch, Danielle. "Japan’s Monkeys Wash their Potatoes and Ride Deer Like Horses." Research Gate. June 9, 2016. Accessed: May 20, 2017.
3 Botham, Noel. Book of Useless Information. New York, New York: Penguin Random House LLC, 2006.
4 Bragg, Rick. "A Drop of Virus from A Monkey Kills a Researcher in 6 Weeks." The New York Times. December 14, 1997. Accessed: May 22, 2017.
5 "Bringing a Monkey into the United States." CDC. September 1, 2016. Accessed: May 19, 2017.
6 Crace, John. "Waiter, My Food is Still Breathing." The Guardian. November 18, 2009. Accessed: May 19, 2017.
7 Davey, Owen. Mad About Monkeys. London, UK: Flying Eye Books, 2015.
8 Demetriou, Danielle. "Monkeys Teach Offspring to Floss Their Teeth." The Telegraph. March 12, 2009. Accessed: May 19, 2017.
9 ———.Monkeys Use Trees to Catapault Themselves out of Japanese Laboratory." The Telegraph. July 7, 2010. Accessed: May 22, 2017.
10 Engelking, Carl. "Monkeys Learn to Recognize Themselves in a Mirror – And Promptly Check Out Their Butts." Discover. January 8, 2015. Accessed: May 21, 2017.
11 Gish, Melissa. Monkeys. Mankato, Minnesota: Living Wild, 2010.
12 Khamsi, Roxanne. "Monkeys Reveal Brain is Hardwired for Counting." New Scientist. October 30, 2007. Accessed: May 18, 2017.
13 "King Pong: Male Monkeys Cover Themselves in their Own Urine to Attract the Ladies." Daily Mail. February 11, 2011. Accessed: May 18, 2017.
14 Knapton, Sarah. "First Head Transplant Successfully Carried Out on Monkey, Claims Surgeon." The Telegraph. January 21, 2016. Accessed: May 22, 2017.
15 Martin, Patricia A. Fink. 2000. Monkeys of Central and South America: A True Book. Washington D.C.: Grolier Publishing Co.
16 "Monkey." Online Etymology Dictionary. Accessed: May 18, 2017.
17 Monkeys. New York, NY: DK Publishing, 2012.
18 "Obese Thai Monkey Who Got Big on Tourists' Junk Food Placed on Strict Diet." The Guardian. May 19, 2017. Accessed: May 19, 2017.
19 Pappas, Stephanie. "Cats and Lizards and Monkeys, Oh My! 9 Islands Ruled by Animals." Live Science. April 17, 2017. Accessed: May 17, 2017.
20 Patton, Don. New World Monkeys. The Child's World, 1996.
21 Redmond, Ian. The Primate Family Tree. Buffalo, NY: Firefly Books (U.S.) Inc., 2008.
22 Schreiber, Anne. Monkeys. National Geographic Society: Washington D.C. 2013.
23 Starr, Michelle. "Compensating: Loudest Howler Monkeys Have the Smallest Balls." C/Net. October 22, 2015. Accessed: May 19, 2017.
24 "The Amazing Orchid that Looks Like a Monkey Face." June 17, 2013. Accessed: May 21, 2017.
25 "The Monkey Bite That Changed History." Avalanche Press. Accessed: May 21, 2017.
26 "The Sneezing Monkeys of Myanmar."BBC. October 27, 2010. Accessed: May 21, 2017.
27 Vleugels, Anouk. "Mad Scientist--Harry Harlow's 'Pit of Despair' for Baby Monkeys." UA Magazine. October 31, 2011. Accessed: May 22, 2017.
28 Weathers, Helen. "I Was Raised By Monkeys After Being Kidnapped and Abandoned in Jungle as a Child, Says Yorkshire Woman." News.com.au. October 22, 2012. Accessed: May 19, 2017.
29 "Where Did HIV Come From?" The AIDS Institute. 2011. Accessed: May 19, 2017.