Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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