Cunningham, W. P. (2006). Principles of environmental science inquiry and applications. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Cunningham, William P. Principles of Environmental Science Inquiry and Applications. McGraw-Hill, 2006.
Lua MLA (8ú heag.)Cunningham, William P. Principles of Environmental Science Inquiry and Applications. McGraw-Hill, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.