APA-viite

P.Cunningham William, & Ann cunningham Mary. (2006). Principles of Environmental Science: Inquiry and Applications (Tái bản lần thứ 3.). America: MC Graw Hill.

Chicago-tyylinen lähdeviittaus

P.Cunningham William, ja Ann cunningham Mary. Principles of Environmental Science: Inquiry and Applications. Tái bản lần thứ 3. America: MC Graw Hill, 2006.

MLA-viite

P.Cunningham William, ja Ann cunningham Mary. Principles of Environmental Science: Inquiry and Applications. Tái bản lần thứ 3. America: MC Graw Hill, 2006.

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