APA (7th ed.) Citation

Swadley, W. C., & Gibbons, A. B. (1976). Geologic map of the Campbellsburg quadrangle, north-central Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Swadley, W. C., and Anthony B. Gibbons. Geologic Map of the Campbellsburg Quadrangle, North-central Kentucky. Reston, Va.: U.S. Geological Survey, 1976.

MLA (9th ed.) Citation

Swadley, W. C., and Anthony B. Gibbons. Geologic Map of the Campbellsburg Quadrangle, North-central Kentucky. U.S. Geological Survey, 1976.