Cita APA (7a ed.)

Portney, P. R., & Dower, R. C. (1990). Public policies for environmental protection. Resources for the Future.

Cita Chicago Style (17a ed.)

Portney, Paul R., y Roger C. Dower. Public Policies for Environmental Protection. Washington, D.C.: Resources for the Future, 1990.

Cita MLA (8a ed.)

Portney, Paul R., y Roger C. Dower. Public Policies for Environmental Protection. Resources for the Future, 1990.