Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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