APA (7th ed.) Citation

Corliss, W. R., & Holden, J. C. (1980). Unknown Earth: A handbook of geological enigmas. Sourcebook Project.

Chicago Style (17th ed.) Citation

Corliss, William R., and John C. Holden. Unknown Earth: A Handbook of Geological Enigmas. Glen Arm, MD: Sourcebook Project, 1980.

MLA (9th ed.) Citation

Corliss, William R., and John C. Holden. Unknown Earth: A Handbook of Geological Enigmas. Sourcebook Project, 1980.