Freedman, B. (2001). Environmental science: A Canadian perspective. Prentice Hall.
Čikaški stil citiranja (17. izdanje)Freedman, Bill. Environmental Science: A Canadian Perspective. Toronto: Prentice Hall, 2001.
MLA način citiranja (8. izdanje)Freedman, Bill. Environmental Science: A Canadian Perspective. Prentice Hall, 2001.
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