APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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