sources of information

• Bookspan, J. Many Are Cold But Few Are Frozen: Another Look at Hypothermia. Retrieved December 3, 2010, from https://www.msu.edu/user/manns/Hypothermia.html
• Burger, J., Gochfeld, M. (2007). Responses of Emperor Penguins (Aptenodytes forsteri) to encounters with ecotourists while commuting to and from their breeding colony. Polar Biology, 30(10). doi: 10.1007/s00300-007-0291-1
• Corsolini, S., Borghesi, N., Schiamone, A., & Focardi, S. (2007). Polybrominated Diphenyl Ethers, Polychlorinated Dibenzo-dioxins, -furans, and -biphenyls in Three Species of Antarctic Penguins. Environmental Science & Pollution Research, 14(6). doi: 10.1065/espr2006.01.017
• Davis, L. S. (2007). Penguins: The Ultimate Question and Answer Book. New York: HarperCollins.
• SeaWorld, Inc. (2005) Penguins. Retrieved October 19, 2010, from http://www.seaworld.org/animal-info/info-books/penguin/pdf/ib-penguin.pdf