APA (7th ed.) Citation

Kepferle, R. C. (1977). Geologic map of the Ballardsville quadrangle, north-central Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Kepferle, Roy Clark. Geologic Map of the Ballardsville Quadrangle, North-central Kentucky. Reston, Va.: U.S. Geological Survey, 1977.

MLA (9th ed.) Citation

Kepferle, Roy Clark. Geologic Map of the Ballardsville Quadrangle, North-central Kentucky. U.S. Geological Survey, 1977.