APA (7th ed.) Citation

Emmons, W. H. (1949). Geology: Principles and processes (2nd ed.). McGraw-HIll.

Chicago Style (17th ed.) Citation

Emmons, William H. Geology: Principles and Processes. 2nd ed. New York: McGraw-HIll, 1949.

MLA (9th ed.) Citation

Emmons, William H. Geology: Principles and Processes. 2nd ed. McGraw-HIll, 1949.