Cita APA (7th ed.)

Nijkamp, P., & Hafkamp, W. (1980). Environmental policy analysis: Operational methods and models. J. Wiley.

Cita Chicago (17th ed.)

Nijkamp, Peter, i Wim Hafkamp. Environmental Policy Analysis: Operational Methods and Models. Chichester [Eng.] ; New York: J. Wiley, 1980.

Cita MLA (8th ed.)

Nijkamp, Peter, i Wim Hafkamp. Environmental Policy Analysis: Operational Methods and Models. J. Wiley, 1980.