APA (7th ed.) Citation

Longwell, C. R., Knopf, A., & Flint, R. F. (1941). Outlines of physical geology (2nd ed.). J. Wiley & Sons.

Chicago Style (17th ed.) Citation

Longwell, Chester R., Adolph Knopf, and Richard Foster Flint. Outlines of Physical Geology. 2nd ed. New York: J. Wiley & Sons, 1941.

MLA (9th ed.) Citation

Longwell, Chester R., et al. Outlines of Physical Geology. 2nd ed. J. Wiley & Sons, 1941.