Perman, R. (2003). Natural resource and environmental economics (3rd ed.). Pearson Addison Wesley.
Citazione stile Chigago Style (17a edizione)Perman, Roger. Natural Resource and Environmental Economics. 3rd ed. Harlow, Essex, Eng: Pearson Addison Wesley, 2003.
Citatione MLA (9a ed.)Perman, Roger. Natural Resource and Environmental Economics. 3rd ed. Pearson Addison Wesley, 2003.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.