Cita APA (7th ed.)

Pipkin, B. W., Trent, D., Hazlett, R., & Bierman, P. (2014). Geology and the environment (Seventh edition.). Brooks/Cole, Cengage Learning.

Cita Chicago (17th ed.)

Pipkin, Bernard W., D.D Trent, Richard Hazlett, i Paul Bierman. Geology and the Environment. Seventh edition. Australia: Brooks/Cole, Cengage Learning, 2014.

Cita MLA (9th ed.)

Pipkin, Bernard W., et al. Geology and the Environment. Seventh edition. Brooks/Cole, Cengage Learning, 2014.