APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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