Botkin, D. B., & Keller, E. A. (2012). Environmental science: International student version (8th ed.). Wiley.
Lua i Stíl Chicago (17ú heag.)Botkin, Daniel B., agus Edward A. Keller. Environmental Science: International Student Version. 8th ed. Hoboken, NJ ; New Delhi: Wiley, 2012.
Lua MLA (8ú heag.)Botkin, Daniel B., agus Edward A. Keller. Environmental Science: International Student Version. 8th ed. Wiley, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.