Lua APA (7ú heag.)

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.

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