APA (7th ed.) Citation

Ridley, B. K. (1979). The physical environment. Ellis Horwood Halsted Press.

Chicago Style (17th ed.) Citation

Ridley, B. K. The Physical Environment. Chicester, Eng., New York: Ellis Horwood Halsted Press, 1979.

MLA (9th ed.) Citation

Ridley, B. K. The Physical Environment. Ellis Horwood Halsted Press, 1979.