20. Corbetta, P. (2003). Social Research; Theory, Methods and Techniques, Sage Publications, London.
21. Creswell, J., W. and V. L Plano Clark, (2007). Designing and Conducting Mixed Methods Research, London: Sage Publication Inc.
22. Fritz Morstein Marx, Ed, Elements of Public Administration (1963) 2nd Ed (Englewood Cliffs, NJ: Prentice-Hall,), p.4
23. Garcia- Alvarez, E. and Lopez- Sintas, J., (2002). Contingency Table: A Two-way Bridge between Qualitative and Quantitative Methods, Field Methods, 14: 270- 287
24. James W. Davis, Jr (1949) Policy and Administration (University, AL: University of Alabama Press.
25. Jantsch, E. (1970). Inter- and trans disciplinary university: A systems approach to Education and innovation. Policy Sciences, 1, 403–428.
26. Kitzinger, J., Barbour, R.S., (1999). Introduction: the challenge and promise of focus groups. In: Barbour, R.S., Kitzinger, J. (Eds.), Developing Focus Group Research. Sage Publications, London.
27. Moran, J. (2002). Interdisciplinary. New York: Routledge.
28. Patton, M. (1987). How to Use Qualitative Methods in Evaluation, London: Sage.
29. Silva, E.G., Teixeira, A.A.C., (2008). Surveying structural change: seminal contributions and a bibliometric account. Structural Change and Economic Dynamics 19, 273–300.
30. Tashakkori, A., and C. Teddlie (2003). "Handbook of Mixed Methods in Social and Behavioral Research", First Edition, Sage Publication Inc.