Παραπομπή APA

Gregg, P. M. (1976). Problems of Theory in Policy Analysis. Lexington Books.

Παραπομπή Chicago Style

Gregg, Phillip M. Problems of Theory in Policy Analysis. Toronto: Lexington Books, 1976.

Παραπομπή MLA

Gregg, Phillip M. Problems of Theory in Policy Analysis. Lexington Books, 1976.