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Asian elephants - threats. (2012, June 10). Retrieved April 29, 2015, from http://wwf.panda.org/what_we_do/endangered_species/elephants/asian_elephants/asianeleph_threats/
Asian Elephant Fact Sheet. (2008, September 1). Retrieved April 30, 2015, from http://library.sandiegozoo.org/factsheets/asian_elephant/asian_elephant.htm
Destinations in Indonesia. (2013, January 1). Retrieved April 30, 2015, from http://www.indonesia.travel/en/destination/622/bukit-barisan-selatan-national-park-home-of-the-sumatran-tigers
Lowland forests. (n.d.). Retrieved April 30, 2015, from http://www.conservenature.org/learn_about_wildlife/costa_rica_rainforest/lowland_forests.htm
Carter-Edwards, T. (2011). Biology 12 (p. 753). Toronto: McGraw-Hill Ryerson.
Sumatran Elephant. (n.d.). Retrieved May 2, 2015, from http://www.worldwildlife.org/species/sumatran-elephant
International Elephant Foundation | Asian and African Elephant Conservation. (1998, January 1). Retrieved May 2, 2015, from http://www.elephantconservation.org/
Elephant Anatomy Facts - Complete Diagram Of Anatomy. (2003, January 1). Retrieved May 3, 2015, from http://animalcorner.co.uk/elephant-anatomy/