Cita APA (7th ed.)

Grubb, P. J., & Whittaker, J. B. (1989). Toward a more exact ecology. Blackwell Scientific Publications.

Cita Chicago (17th ed.)

Grubb, Peter J., i John B. Whittaker. Toward a More Exact Ecology. Oxford: Blackwell Scientific Publications, 1989.

Cita MLA (9th ed.)

Grubb, Peter J., i John B. Whittaker. Toward a More Exact Ecology. Blackwell Scientific Publications, 1989.