Citazione Stile APA (7a Edizione)

Perman, R. (2011). Natural resource and environmental economics (4th ed.). Pearson Education.

Citazione stile Chigago Style (17a edizione)

Perman, Roger. Natural Resource and Environmental Economics. 4th ed. Harlow, Essex, Eng: Pearson Education, 2011.

Citatione MLA (9a ed.)

Perman, Roger. Natural Resource and Environmental Economics. 4th ed. Pearson Education, 2011.