Cita APA

National Park Foundation, & Moker, M. (2009). The official guide to America's National Parks (13. edition.). New York: Fodor's travel.

Citación estilo Chicago

National Park Foundation, y Molly Moker. The Official Guide to America's National Parks. 13. edition. New York: Fodor's travel, 2009.

Cita MLA

National Park Foundation, y Molly Moker. The Official Guide to America's National Parks. 13. edition. New York: Fodor's travel, 2009.