APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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