APA (7th ed.) Citation

Richmond, J. F., & Gray, C. H. (1960). Geology of the San Bernardino Mountains north of Big Bear Lake, California. [publisher not identified].

Chicago Style (17th ed.) Citation

Richmond, James Frank, and Cliffton H. Gray. Geology of the San Bernardino Mountains North of Big Bear Lake, California. San Francisco: [publisher not identified], 1960.

MLA (9th ed.) Citation

Richmond, James Frank, and Cliffton H. Gray. Geology of the San Bernardino Mountains North of Big Bear Lake, California. [publisher not identified], 1960.