Dyfyniad APA

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

Dyfyniad Arddull Chicago

Hanley,Nick. Environmental Economics: : In Theory and Practice. Chennai: 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.