APA (7e ed.) Bronvermelding

LONGWELL, C. R. (1962). Introduction to physical geology. John Wiley.

Chicago (17e ed.) Bronvermelding

LONGWELL, Chester R. Introduction to Physical Geology. New York: John Wiley, 1962.

MLA (9e ed.) Bronvermelding

LONGWELL, Chester R. Introduction to Physical Geology. John Wiley, 1962.