Watt, K. E. F. (1966). Systems analysis in ecology. Academic Press.
Lua i Stíl Chicago (17ú heag.)Watt, Kenneth E. F. Systems Analysis in Ecology. New York: Academic Press, 1966.
Lua MLA (9ú heag.)Watt, Kenneth E. F. Systems Analysis in Ecology. Academic Press, 1966.
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