Cita APA (7th ed.)

Roger Perman. (1999). Natural resource environmental economics. Financial Times, Prentice-Hall / Person Education.

Cita Chicago (17th ed.)

Roger Perman. Natural Resource Environmental Economics. Harlow: Financial Times, Prentice-Hall / Person Education, 1999.

Cita MLA (9th ed.)

Roger Perman. Natural Resource Environmental Economics. Financial Times, Prentice-Hall / Person Education, 1999.