APA

Longwell C. R., Knopf A. & Flint R. F. (1939). Outlines of physical geology. New York: J. Wiley & sons, inc.

Chicago

Longwell Chester R, Knopf Adolph and Flint Richard Foster. 1939. Outlines of physical geology. New York: J. Wiley & sons, inc.

Harvard

Longwell C. R., Knopf A. and Flint R. F. (1939). Outlines of physical geology. New York: J. Wiley & sons, inc.

MLA

Longwell Chester R, Knopf Adolph and Flint Richard Foster. Outlines of physical geology. New York: J. Wiley & sons, inc. 1939.