Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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