APA (7th ed.) Citation

Dibblee, T. W. (1967). Geologic map of the Ludlow quadrangle, San Bernardino County, California. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Dibblee, T. W. Geologic Map of the Ludlow Quadrangle, San Bernardino County, California. Washington, D.C.: U.S. Geological Survey, 1967.

MLA (9th ed.) Citation

Dibblee, T. W. Geologic Map of the Ludlow Quadrangle, San Bernardino County, California. U.S. Geological Survey, 1967.