Cren, E. L. (1980). The functioning of freshwater ecosystems. Cambridge University Press.
Chicago-čujuhus (17. p.)Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge: Cambridge University Press, 1980.
MLA-čujuhus (9. p.)Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge University Press, 1980.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.