6Gallessich, J. 1982, The Profession and Practice of Consultation : A Handbook for Consultants, Traniers of Consultants, and Consumers of Consultation Services ,Sen Francisco : Jossey-Bass.
7Greenwood, E. 1966, "The Elements of Professionalization. "In H.M. Vollmer & D.L. Mills ( eds. ), Professionalization,Engiewood Cliffs, NJ: Prentics- Hall.
8Hughes , E . C .1958 , Men and Their Work,New York:Free Press.
9Kubr,M. ,et al.(eds.)1986, Management Consulting: A Guide to the Profession,Geneva:ILB,U.N.
10Moore, W. E. 1970, The Professions :Roles and Rules, New York: Russell Sage Foundation.