APA (7th ed.) Citation

Lewis, R. Q., & Hansen, D. E. (1978). Geologic map of the Big Creek quadrangle, southeastern Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Lewis, Richard Quintin, and Dan E. Hansen. Geologic Map of the Big Creek Quadrangle, Southeastern Kentucky. Reston, Va.: U.S. Geological Survey, 1978.

MLA (9th ed.) Citation

Lewis, Richard Quintin, and Dan E. Hansen. Geologic Map of the Big Creek Quadrangle, Southeastern Kentucky. U.S. Geological Survey, 1978.

Warning: These citations may not always be 100% accurate.