APA Citatie

Botkin, D. B., & Keller, E. A. (2014). Environmental science: Earth as a living planet (9th ed.). Wiley.

Chicago Style citaat

Botkin, Daniel B., en Edward A. Keller. Environmental Science: Earth as a Living Planet. 9th ed. New Jersey: Wiley, 2014.

MLA citatie

Botkin, Daniel B., en Edward A. Keller. Environmental Science: Earth as a Living Planet. 9th ed. Wiley, 2014.