Cita APA (7th ed.)

Perman, R., Ma, Y., & McGilvray, J. (2003). Natural resource and environmental economics (3rd ed.). Pearson Education.

Cita Chicago (17th ed.)

Perman, Roger, Yue Ma, i James McGilvray. Natural Resource and Environmental Economics. 3rd ed. Harlow, Essex: Pearson Education, 2003.

Cita MLA (9th ed.)

Perman, Roger, et al. Natural Resource and Environmental Economics. 3rd ed. Pearson Education, 2003.