Cita APA

National Geographic Society. Cartographic Division, & Darley, J. M. (1957). Europe. Washington, D.C.: [editor no identificado].

Citación estilo Chicago

National Geographic Society. Cartographic Division, y James Morrison Darley. Europe. Washington, D.C.: [editor no identificado], 1957.

Cita MLA

National Geographic Society. Cartographic Division, y James Morrison Darley. Europe. Washington, D.C.: [editor no identificado], 1957.