5Becker, G. (1983) "A theory of competition among pressure groups for political influence", Quarterly Journal of Economics, vol. 98.
6Cobb, Rogers W & Charles D Elder. "Communication and Public Policy"Dan Nimmo and Keith Sanders Handbook of Policital Communication Sage Publications, 1981.
7Caharles W. Anderson, Public Policy- making. New York:Praeger, 1975.
8Douglas E. Ashford editor, Comparing Public Policities: New Concepts and Methods, London: Sage Publications LTD,1978.
9Doris A. Graber,Mass Media and American Politic(4nd,ed)Washington, D C : A Division of Congressional Quarterly.Inc 1993.
