APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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