Παραπομπή APA

Berck, P., & Helfand, G. (2011). Economics of the environment: Peter Berck and Gloria Helfand. Addison - Wesley.

Παραπομπή Chicago Style

Berck, Peter, και Gloria Helfand. Economics of the Environment: Peter Berck and Gloria Helfand. Boston: Addison - Wesley, 2011.

Παραπομπή MLA

Berck, Peter, και Gloria Helfand. Economics of the Environment: Peter Berck and Gloria Helfand. Addison - Wesley, 2011.