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