APA (7th ed.) Citation

Geological Survey (U.S.), Johnson, W. D., Jr, & Norris, R. L. (1974). Geologic map of the Smith Mills quadrangle, Henderson and Union counties, Kentucky. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), William D. Johnson, Jr, and Ronald L. Norris. Geologic Map of the Smith Mills Quadrangle, Henderson and Union Counties, Kentucky. Reston, Va.: The Survey, 1974.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic Map of the Smith Mills Quadrangle, Henderson and Union Counties, Kentucky. The Survey, 1974.