APA (7th ed.) Citation

Longwell, C. R., Knopf, A., Flint, R. F., Schuchert, C., & Dumbart, C. O. (1939). A textbook of geology (2a. ed.). John Wiley.

Chicago Style (17th ed.) Citation

Longwell, Chester Ray, Adolph Knopf, Richard Foster Flint, Charles Schuchert, and Carl O. Dumbart. A Textbook of Geology. 2a. ed. Nueva York: John Wiley, 1939.

MLA (9th ed.) Citation

Longwell, Chester Ray, et al. A Textbook of Geology. 2a. ed. John Wiley, 1939.