APA (7th ed.) Citation

Cren, E. L. (1980). The functioning of freshwater ecosystems. Cambridge University Press.

Chicago Style (17th ed.) Citation

Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge: Cambridge University Press, 1980.

MLA (9th ed.) Citation

Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge University Press, 1980.