Cita APA (7th ed.)

Perman, R., Yue, M., & McGilvray, J. (1996). Natural resources and environmental economics. Longman.

Cita Chicago (17th ed.)

Perman, Roger, Ma Yue, i James McGilvray. Natural Resources and Environmental Economics. London: Longman, 1996.

Cita MLA (9th ed.)

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