Cita APA (7a ed.)

Berck, P., & Helfand, G. E. (2011). The economics of the environment. PHI Learning.

Cita Chicago Style (17a ed.)

Berck, Peter, y Gloria E. Helfand. The Economics of the Environment. New Delhi: PHI Learning, 2011.

Cita MLA (9a ed.)

Berck, Peter, y Gloria E. Helfand. The Economics of the Environment. PHI Learning, 2011.