APA-referens

Craig, J. R., Vaughan, D. J., & Skinner, B. J. (2011). Earth resources and the environment (4th ed.). Prentice Hall.

Chicago-stil citat

Craig, James R., David J. Vaughan, och Brian J. Skinner. Earth Resources and the Environment. 4th ed. Boston: Prentice Hall, 2011.

MLA-referens

Craig, James R., et al. Earth Resources and the Environment. 4th ed. Prentice Hall, 2011.