Schullery, P. (2001). America's national parks: The spectacular forces that shaped our treasured lands (1a. ed.). Discovery Channel.
Chicago-Zitierstil (17. Ausg.)Schullery, Paul. America's National Parks: The Spectacular Forces That Shaped Our Treasured Lands. 1a. ed. Nueva York: Discovery Channel, 2001.
MLA-Zitierstil (9. Ausg.)Schullery, Paul. America's National Parks: The Spectacular Forces That Shaped Our Treasured Lands. 1a. ed. Discovery Channel, 2001.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.