APA-referens (7:e uppl.)

Siebert, H. (2005). Economics of the environment: Theory and policy (6th, rev. ed.). Springer.

Chicago-referens (17:e uppl.)

Siebert, Horst. Economics of the Environment: Theory and Policy. 6th, rev. ed. Berlin: Springer, 2005.

MLA-referens (9:e uppl.)

Siebert, Horst. Economics of the Environment: Theory and Policy. 6th, rev. ed. Springer, 2005.