Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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