APA (7th ed.) Citation

Roberts, R. D., & Roberts, T. M. (1984). Planning and ecology. Chapman and Hall.

Chicago Style (17th ed.) Citation

Roberts, R. D., and T. M. Roberts. Planning and Ecology. London ; New York: Chapman and Hall, 1984.

MLA (9th ed.) Citation

Roberts, R. D., and T. M. Roberts. Planning and Ecology. Chapman and Hall, 1984.