Alan Pounds, Robert Puschendorf, Federico Bolaños, Gerardo Chaves, Martha Crump, Frank Solís, Roberto Ibáñez, Jay Savage, César Jaramillo, Querube Fuenmayor, Karen Lips 2008. Atelopus varius. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. <www.iucnredlist.org>.
Eilperin, Juliet. "Warming Tied To Extinction Of Frog Species." The Washington Post. N.p., 12 Jan. 2006. Web. 1 Jan. http://www.washingtonpost.com/wp-dyn/content/article/2006/01/11/AR2006011102121.html.
Handwerk, Brian. "Frog Extinctions Linked to Global Warming." National Geographic. National Geographic Society, 12 Jan. 2006. Web. 22 Apr. 2010. http://news.nationalgeographic.com/news/2006/01/0112_060112_frog_climate_2.html.
Alan Pounds, Robert Puschendorf, Federico Bolaños, Gerardo Chaves, Martha Crump, Frank Solís, Roberto Ibáñez, Jay Savage, César Jaramillo, Querube Fuenmayor, Karen Lips 2008. Atelopus varius. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. <www.iucnredlist.org>.
Images
http://animal.discovery.com/tv/vanishing-frogs/top-5/images/variable-harlequin-frog.jpg
http://www.iucnredlist.org/rzRemote/sis.iucnsis.org/raw/images/bin/1276790792_rzA_0_170.jpg
http://www.iucnredlist.org/apps/redlist/images/range/thumbs/54560.png