Cita APA (7th ed.)

Botkin, D. B., & Keller, E. A. (2012). Environmental science: International student version (8th ed.). Wiley.

Cita Chicago (17th ed.)

Botkin, Daniel B., i Edward A. Keller. Environmental Science: International Student Version. 8th ed. Hoboken, NJ ; New Delhi: Wiley, 2012.

Cita MLA (8th ed.)

Botkin, Daniel B., i Edward A. Keller. Environmental Science: International Student Version. 8th ed. Wiley, 2012.