Dyfyniad APA

Hanley, N. (1997). Environmental economics in theory and practice. Macmillan.

Dyfyniad Arddull Chicago

Hanley, Nick. Environmental Economics in Theory and Practice. London: Macmillan, 1997.

Dyfyniad MLA

Hanley, Nick. Environmental Economics in Theory and Practice. Macmillan, 1997.

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