APA (7e ed.) Bronvermelding

Leet, L. D., Judson, S., & Kauffman, M. E. (1978). Physical geology (Fifth edition.). Prentice-Hall.

Chicago (17e ed.) Bronvermelding

Leet, L. Don, Sheldon Judson, en Marvin E. Kauffman. Physical Geology. Fifth edition. Englewood Cliffs, New Jersey: Prentice-Hall, 1978.

MLA (9e ed.) Bronvermelding

Leet, L. Don, et al. Physical Geology. Fifth edition. Prentice-Hall, 1978.