1. Drummond, R.J. and Ryan. C w. (19995) .Career counseling:A developmental Approach. Prentice hall.
2. Vocational Indecision: more evidence and speculation;Holland;Journal off counseling psychology.,1977
3. Making Vocational Choices;Holland,1995
4. What is the Right Profession for You?”;Olland,1994
5. Robins, P. Steven (1994), “organizational Behvior”, translated by Parsian, A. & Erabi, M. (2002), vol.1 (fourth edi tion), Bureau of Cultural Studies.