APA (7th ed.) Citation

Judson, S., Kauffman, M. E., & Leet, L. D. (1987). Physical geology.

Chicago Style (17th ed.) Citation

Judson, Sheldon, Marvin E. Kauffman, and L. Don Leet. Physical Geology. 1987.

MLA (8th ed.) Citation

Judson, Sheldon, et al. Physical Geology. 1987.