National Geographic Society, National Geographic Book Service, & Bennett, R. S. (1980). The new America's wonderlands: Our National Parks. National Geographic Society.
Citazione stile Chigago Style (17a edizione)National Geographic Society, National Geographic Book Service, e Ross S. Bennett. The New America's Wonderlands: Our National Parks. Washington: National Geographic Society, 1980.
Citatione MLA (9a ed.)National Geographic Society, et al. The New America's Wonderlands: Our National Parks. National Geographic Society, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.