APA (7th ed.) Citation

Geological Survey (U.S.), Kentucky Geological Survey, & Luft, S. J. (1971). Geologic map of part of the Covington quadrangle, Northern Kentucky. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Kentucky Geological Survey, and Stanley Jeremie Luft. Geologic Map of Part of the Covington Quadrangle, Northern Kentucky. Washington, D.C.: The Survey, 1971.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic Map of Part of the Covington Quadrangle, Northern Kentucky. The Survey, 1971.