APA (7th ed.) Citation

Geological Survey (U.S.) & Robertson, J. F. (1986). Geologic map of the Crownpoint quadrangle, McKinley County, New Mexico. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and J. F. Robertson. Geologic Map of the Crownpoint Quadrangle, McKinley County, New Mexico. Reston, Va.: The Survey, 1986.

MLA (9th ed.) Citation

Geological Survey (U.S.) and J. F. Robertson. Geologic Map of the Crownpoint Quadrangle, McKinley County, New Mexico. The Survey, 1986.