National Geographic Society (United States). Book Division. (1995). National parks of North America: Canada, United States, Mexico. The National Geographic Society.
Chicagoスタイル(17版)引用形式National Geographic Society (United States). Book Division. National Parks of North America: Canada, United States, Mexico. Washington, D.C: The National Geographic Society, 1995.
MLA(9版)引用形式National Geographic Society (United States). Book Division. National Parks of North America: Canada, United States, Mexico. The National Geographic Society, 1995.
警告: この引用は必ずしも正確ではありません.