Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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