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