Dyfyniad APA

Tolley, G. S. (1981). Environmental policy: Elements of environmental analysis. Ballinger.

Dyfyniad Arddull Chicago

Tolley, George S. Environmental Policy: Elements of Environmental Analysis. Cambridge: Ballinger, 1981.

Dyfyniad MLA

Tolley, George S. Environmental Policy: Elements of Environmental Analysis. Ballinger, 1981.

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