Botkin, D. B., & Keller, E. A. (2003). Environmental science: Earth as a living planet (Forth edition.). Wiley.
Lua i Stíl Chicago (17ú heag.)Botkin, Daniel B., agus Edward A. Keller. Environmental Science: Earth as a Living Planet. Forth edition. New York: Wiley, 2003.
Lua MLA (8ú heag.)Botkin, Daniel B., agus Edward A. Keller. Environmental Science: Earth as a Living Planet. Forth edition. Wiley, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.