APA (7th ed.) Citation

Geological Survey (U.S.) & Briskey, J. A. (1979). Reconnaissance geologic map of the Gu Achi quadrangle, Pima County, Arizona. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Joseph A. Briskey. Reconnaissance Geologic Map of the Gu Achi Quadrangle, Pima County, Arizona. Reston, Va.: The Survey, 1979.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Joseph A. Briskey. Reconnaissance Geologic Map of the Gu Achi Quadrangle, Pima County, Arizona. The Survey, 1979.