APA (7th ed.) Citation

Morton, D. M., Bovard, K. R., & Alvarez, R. M. H. (1999). Preliminary digital geologic map of the Santa Ana 30ʹ x 60ʹ quadrangle, southern California (Version 1.0.). U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Morton, Douglas M., Kelly R. Bovard, and Rachel M. H. Alvarez. Preliminary Digital Geologic Map of the Santa Ana 30ʹ X 60ʹ Quadrangle, Southern California. Version 1.0. [Reston, Va.?]: U.S. Department of the Interior, U.S. Geological Survey, 1999.

MLA (9th ed.) Citation

Morton, Douglas M., et al. Preliminary Digital Geologic Map of the Santa Ana 30ʹ X 60ʹ Quadrangle, Southern California. Version 1.0. U.S. Department of the Interior, U.S. Geological Survey, 1999.