Cren, E. L. (1980). The functioning of freshwater ecosystems. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge: Cambridge University Press, 1980.
Lua MLA (9ú heag.)Cren, E.D. Le. The Functioning of Freshwater Ecosystems. Cambridge University Press, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.