Cren, E. L. (1980). The functioning of freshwater ecosystems. Cambridge University Press.
Čikaški stil citiranja (17. izdanje)Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge: Cambridge University Press, 1980.
MLA način citiranja (9. izdanje)Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge University Press, 1980.
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