Cunningham, W. P., & Cunningham, M. A. (2006). Principles of environmental science: Inquiry and applications (3rd ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Cunningham, William P., agus Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 3rd ed. Dubuque, IA: McGraw-Hill, 2006.
Lua MLA (8ú heag.)Cunningham, William P., agus Mary Ann Cunningham. Principles of Environmental Science: Inquiry and Applications. 3rd ed. McGraw-Hill, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.