APA (7th ed.) Citation

Krebs, C. J. (1988). The message of ecology. Harper & Row.

Chicago Style (17th ed.) Citation

Krebs, Charles J. The Message of Ecology. New York [u.a.]: Harper & Row, 1988.

MLA (9th ed.) Citation

Krebs, Charles J. The Message of Ecology. Harper & Row, 1988.