APA (7th ed.) Citation

Johnson, W. D., Jr. (1978). Geologic map of the Madrid quadrangle, western Kentucky. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Johnson, William D., Jr. Geologic Map of the Madrid Quadrangle, Western Kentucky. Reston, Va.: U.S. Geological Survey, 1978.

MLA (9th ed.) Citation

Johnson, William D., Jr. Geologic Map of the Madrid Quadrangle, Western Kentucky. U.S. Geological Survey, 1978.