APA (7th ed.) Citation

National Geographic Society (U.S.). Cartographic Division, Grosvenor, M. B., & Darley, J. M. (1961). Italy. The Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Cartographic Division, Melville Bell Grosvenor, and James M. Darley. Italy. Washington: The Society, 1961.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Cartographic Division, et al. Italy. The Society, 1961.