APA (7th ed.) Citation

Perman, R., Ma, Y., & McGilvray, J. (1996). Natural resource and environmental economics. Longman.

Chicago Style (17th ed.) Citation

Perman, Roger, Yue Ma, and James McGilvray. Natural Resource and Environmental Economics. New York: Longman, 1996.

MLA (9th ed.) Citation

Perman, Roger, et al. Natural Resource and Environmental Economics. Longman, 1996.