Dyfyniad APA

Bowers,John. (1997). Sustainability and environmental economics: An alternative text. Prentice-hall.

Dyfyniad Arddull Chicago

Bowers,John. Sustainability and Environmental Economics: An Alternative Text. Harlow: Prentice-hall, 1997.

Dyfyniad MLA

Bowers,John. Sustainability and Environmental Economics: An Alternative Text. Prentice-hall, 1997.

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