Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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