National Geographic Society, National Geographic Book Service, & Bennett, R. S. (1980). The new America's wonderlands: Our National Parks. National Geographic Society.
Style de citation Chicago (17e éd.)National Geographic Society, National Geographic Book Service, et Ross S. Bennett. The New America's Wonderlands: Our National Parks. Washington: National Geographic Society, 1980.
Style de citation MLA (9e éd.)National Geographic Society, et al. The New America's Wonderlands: Our National Parks. National Geographic Society, 1980.
Attention : ces citations peuvent ne pas être correctes à 100%.