APA (7th ed.) Citation

Outerbridge, W. F. (1968). Geologic map of the David quadrangle, eastern Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Outerbridge, William F. Geologic Map of the David Quadrangle, Eastern Kentucky. Washington, D.C.: U.S. Geological Survey, 1968.

MLA (9th ed.) Citation

Outerbridge, William F. Geologic Map of the David Quadrangle, Eastern Kentucky. U.S. Geological Survey, 1968.