APA (7th ed.) Citation

Luft, S. J. (1977). Geologic map of the Smithfield quadrangle, north-central Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Luft, Stanley Jeremie. Geologic Map of the Smithfield Quadrangle, North-central Kentucky. Reston, Va.: U.S. Geological Survey, 1977.

MLA (9th ed.) Citation

Luft, Stanley Jeremie. Geologic Map of the Smithfield Quadrangle, North-central Kentucky. U.S. Geological Survey, 1977.

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