Cunningham, W. P., & Cunningham, M. A. (2013). Principles of environmental science: Inquiry & applications (7th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Cunningham, William P., agus Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. 7th ed. New York, NY: McGraw-Hill, 2013.
Lua MLA (9ú heag.)Cunningham, William P., agus Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. 7th ed. McGraw-Hill, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.