Perman, R., Ma, Y., McGilvray, J., & Common, M. (2003). Natural resource and environmental economics (Third edition.). Pearson Education.
Lua i Stíl Chicago (17ú heag.)Perman, Roger, Yue Ma, James McGilvray, agus Michael Common. Natural Resource and Environmental Economics. Third edition. New York: Pearson Education, 2003.
Lua MLA (8ú heag.)Perman, Roger, et al. Natural Resource and Environmental Economics. Third edition. Pearson Education, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.