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Dyfyniad Arddull ChicagoCren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge: Cambridge University Press, 1980.
Dyfyniad MLACren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge University Press, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.