APA (7th ed.) Citation

Grand Canyon Natural History Association, Geological Survey (U.S.), & Williams and Heintz Map Corporation. (1986). Geologic map of the eastern part of the Grand Canyon National Park, Arizona (1986 ed.). The Association.

Chicago Style (17th ed.) Citation

Grand Canyon Natural History Association, Geological Survey (U.S.), and Williams and Heintz Map Corporation. Geologic Map of the Eastern Part of the Grand Canyon National Park, Arizona. 1986 ed. Grand Canyon, Ariz.: The Association, 1986.

MLA (9th ed.) Citation

Grand Canyon Natural History Association, et al. Geologic Map of the Eastern Part of the Grand Canyon National Park, Arizona. 1986 ed. The Association, 1986.