Chiras, D. D. (2001). Environmental science: Creating a sustainable future (6th ed.). Jones and Bartlett Publishers.
Lua i Stíl Chicago (17ú heag.)Chiras, Daniel D. Environmental Science: Creating a Sustainable Future. 6th ed. Sudbury, MA: Jones and Bartlett Publishers, 2001.
Lua MLA (9ú heag.)Chiras, Daniel D. Environmental Science: Creating a Sustainable Future. 6th ed. Jones and Bartlett Publishers, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.