APA استشهاد

Botkin, D. B., & Keller, E. A. (2012). Environmental science (8th ed.). Wiley- Blackwell.

استشهاد بنمط شيكاغو

Botkin, Daniel B., و Edward A. Keller. Environmental Science. 8th ed. New Delhi: Wiley- Blackwell, 2012.

MLA استشهاد

Botkin, Daniel B., و Edward A. Keller. Environmental Science. 8th ed. Wiley- Blackwell, 2012.