APA (7e ed.) Bronvermelding

Leet, L. D., & Leet, F. J. (1961). The world of geology. McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Leet, Lewis Don, en Florence J. Leet. The World of Geology. New York: McGraw-Hill, 1961.

MLA (9e ed.) Bronvermelding

Leet, Lewis Don, en Florence J. Leet. The World of Geology. McGraw-Hill, 1961.