Roger Perman. (1999). Natural resource environmental economics. Financial Times, Prentice-Hall / Person Education.
Citazione stile Chigago Style (17a edizione)Roger Perman. Natural Resource Environmental Economics. Harlow: Financial Times, Prentice-Hall / Person Education, 1999.
Citatione MLA (9a ed.)Roger Perman. Natural Resource Environmental Economics. Financial Times, Prentice-Hall / Person Education, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.