APA

Halfon E., . (1979). Theoretical systems ecology. New York, New York: Academic Press.

Chicago

Halfon Efraim, . 1979. Theoretical systems ecology. New York, New York: Academic Press.

Harvard

Halfon E., . (1979). Theoretical systems ecology. New York, New York: Academic Press.

MLA

Halfon Efraim, . Theoretical systems ecology. New York, New York: Academic Press. 1979.