Cita APA (7th ed.)

Berck, P., & Helfand, G. E. (2011). The Economics of the environment (International edition.). Pearson Addison-Wesley.

Cita Chicago (17th ed.)

Berck, Peter, i Gloria E. Helfand. The Economics of the Environment. International edition. Boston: Pearson Addison-Wesley, 2011.

Cita MLA (9th ed.)

Berck, Peter, i Gloria E. Helfand. The Economics of the Environment. International edition. Pearson Addison-Wesley, 2011.