Cita APA (7th ed.)
Botkin, D. B., & Keller, E. A. (2012). Environmental science: International student version (8th ed.). John Wiley & Sons.
Cita Chicago (17th ed.)
Botkin, Daniel B., i Edward A. Keller. Environmental Science: International Student Version. 8th ed. New Delhi: John Wiley & Sons, 2012.
Cita MLA (9th ed.)
Botkin, Daniel B., i Edward A. Keller. Environmental Science: International Student Version. 8th ed. John Wiley & Sons, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.