Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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