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"From NPS.gov." Message to the author. 29 Apr. 2013. E-mail.
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"Bighorn Sheep (Ovis Canadensis)." Arkive. N.p., 2013. Web. 15 Apr. 2013. <www.arkive.org/bighorn-sheep/ovis-canadensis/>.
"Chipmunks losing genetic diversity." Geographical Apr. 2012: 15. Student Resources in Context. Web. 18 Apr. 2013.
"FAQ- Frequently Asked Questions." Visit Yosemite This Year. N.p., n.d. Web. 29 Apr. 2013.
Freedman, Bill. "Keystone Species." Environmental Encyclopedia. 4th ed. Vol. 1. Detroit: Gale, 2011. 952-954. Gale Virtual Reference Library. Web. 21 Apr. 2013.
"From NPS.gov." Message to the author. 29 Apr. 2013. E-mail.
"Geochemical Cycles." Encyclopedia of Earth and Space Science. Timothy Kusky. Ed. Katherine Cullen. Vol. 1. New York: Facts on File, 2010. 307-309. Facts on File Science Library. Gale Virtual Reference Library. Web. 18 Apr. 2013.
Markle, Kallie. "Hidden Yosemite: explore the high country to complete the Yosemite experience." National Parks Spring 2012. Student Resources in Context. Web. 18 Apr. 2013.
"Only A Day." OhRanger.com. N.p., 2012. Web. 29 Apr. 2013.
"Sierra Nevada Bighorn Sheep Facts." California Department of Fish and Wildlife. N.p., n.d. Web. 7 Apr. 2013. <http://www.dfg.ca.gov/snbs/SheepFacts.html>.
U.S. Department of the Interior. N.p., 26 Apr. 2013. Web. 29 Apr. 2013.
"Yosemite FAQs." A Guide to Yosemite National Park. N.p., Jan. 2012. Web. 29 Apr. 2013.
"Yosemite." National Park Service. U.S. Department of the Interior, 5 Apr. 2013. Web. 7 Apr. 2013.
"Yosemite National Park: What to Bring with You to YNP." Tripadvisor. N.p., 2013. Web. 29 Apr. 2013.