APA (7e ed.) Bronvermelding

Longwell, C. R., Knofp, A., & Flint, R. F. (1948). Physical geology (3.).

Chicago (17e ed.) Bronvermelding

Longwell, Chester R., Adolph Knofp, en Richard F. Flint. Physical Geology. 3. New York, New York : Willey, 1948.

MLA (9e ed.) Bronvermelding

Longwell, Chester R., et al. Physical Geology. 3. 1948.