Cita APA (7th ed.)

Milgrom, H., & Crews, D. (1972). ABC of ecology. Collier Books.

Cita Chicago (17th ed.)

Milgrom, Harry, i Donald Crews. ABC of Ecology. New York: Collier Books, 1972.

Cita MLA (9th ed.)

Milgrom, Harry, i Donald Crews. ABC of Ecology. Collier Books, 1972.