APA (7e ed.) Bronvermelding

Pipkin, B. W., & Trent, D. D. (1997). Geology and the environment (2nd ed.). Wadsworth Publishing Co.

Chicago (17e ed.) Bronvermelding

Pipkin, Bernard W., en D. D. Trent. Geology and the Environment. 2nd ed. Belmont, California: Wadsworth Publishing Co, 1997.

MLA (9e ed.) Bronvermelding

Pipkin, Bernard W., en D. D. Trent. Geology and the Environment. 2nd ed. Wadsworth Publishing Co, 1997.