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.
Chicago-Zitierstil (17. Ausg.)National Geographic Society, Christine Eckstrom Lee, Mark Miller, Thomas O'Neill, Bill Richards, und Jennifer C. Urquhart. Window on America: Discovering Her Natural Beauty. Washington: National Geographic Society, 1987.
MLA-Zitierstil (9. Ausg.)National Geographic Society, et al. Window on America: Discovering Her Natural Beauty. National Geographic Society, 1987.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.