APA (7th ed.) Citation

Geological Survey (U.S.) & Drake, A. A. (1994). Geologic map of the Manassas quadrangle, Fairfax and Prince William counties, Virginia. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Avery Ala Drake. Geologic Map of the Manassas Quadrangle, Fairfax and Prince William Counties, Virginia. Reston, VA: The Survey, 1994.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Avery Ala Drake. Geologic Map of the Manassas Quadrangle, Fairfax and Prince William Counties, Virginia. The Survey, 1994.