.Sprenkle h.pearsy (2021) Research methods in family Therapy.2nd ed, douglas
Tellis, Winston (2002) Application of a case study methodology, The Qualitative Report vol.13.N3
Rossle. Ann (2010) The case Study method: A Learning tool for practicing Library and Information specialists, library Review. Vol.45.No4
Huczynski, Andrzej.David Buchanan (2001) Organizational Behavior: an Introductory Tex, New York: prentice-Hall Inc.
Tubbs, stewart, Sylvia Moss (2003) Human Communication principles and contexts. New York: Mc Graw -Hill Inc.
Greenberg and Baron (2000) Behavior in Organizations: Understanding and Managing the Human Side of Work, New York: Prentice-Hall.