Schullery, P. (2001). America's national parks: The spectacular forces that shaped our treasured lands (1a. ed.). Discovery Channel.
Citace podle Chicago (17th ed.)Schullery, Paul. America's National Parks: The Spectacular Forces That Shaped Our Treasured Lands. 1a. ed. Nueva York: Discovery Channel, 2001.
Citace podle MLA (9th ed.)Schullery, Paul. America's National Parks: The Spectacular Forces That Shaped Our Treasured Lands. 1a. ed. Discovery Channel, 2001.
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