APA (7th ed.) Citation

Kentucky Geological Survey, Geological Survey (U.S.), & Potts, R. B. (1988). Index to geologic maps for Kentucky. The Survey.

Chicago Style (17th ed.) Citation

Kentucky Geological Survey, Geological Survey (U.S.), and Roger B. Potts. Index to Geologic Maps for Kentucky. [Lexington, Ky.]: The Survey, 1988.

MLA (9th ed.) Citation

Kentucky Geological Survey, et al. Index to Geologic Maps for Kentucky. The Survey, 1988.