Citazione Stile APA (7a Edizione)

National Geographic Society, Lee, C. E., Miller, M., O'Neill, T., Richards, B., & Urquhart, J. C. (1987). Window on America: Discovering her natural beauty. National Geographic Society.

Citazione stile Chigago Style (17a edizione)

National Geographic Society, Christine Eckstrom Lee, Mark Miller, Thomas O'Neill, Bill Richards, e Jennifer C. Urquhart. Window on America: Discovering Her Natural Beauty. Washington: National Geographic Society, 1987.

Citatione MLA (9a ed.)

National Geographic Society, et al. Window on America: Discovering Her Natural Beauty. National Geographic Society, 1987.