Yosemite National Park, California
Yosemite National Park. Photograph. Encyclopedia Britannica Online. Web. 15 Aug. 2012.
U.S. land and natural resources policy : history, debates, state data, maps, primary documents (2nd edition) by 
Seed of the future : Yosemite and the evolution of the national park idea by Search online databases for more sources from scholarly journals, magazines, newspapers, and media.