Dyfyniad APA

Bishop,Richard C, & Romano,Donato. (1998). Environmental resource valuation: Applications of the contigent valuation method in Italy. Kluwer Academic Publishers.

Dyfyniad Arddull Chicago

Bishop,Richard C, and Romano,Donato. Environmental Resource Valuation: Applications of the Contigent Valuation Method in Italy. Boston: Kluwer Academic Publishers, 1998.

Dyfyniad MLA

Bishop,Richard C, and Romano,Donato. Environmental Resource Valuation: Applications of the Contigent Valuation Method in Italy. Kluwer Academic Publishers, 1998.

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