Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.