Παραπομπή APA

Hanley, N., & Barbier, E. (2009). Pricing nature: Cost- benifit analyisis and Environmental policy. Edward Elgar.

Παραπομπή Chicago Style

Hanley, Nick, και Edward Barbier. Pricing Nature: Cost- Benifit Analyisis and Environmental Policy. Cheltenham, UK ; Northampton, MA: Edward Elgar, 2009.

Παραπομπή MLA

Hanley, Nick, και Edward Barbier. Pricing Nature: Cost- Benifit Analyisis and Environmental Policy. Edward Elgar, 2009.