Litwin, M. (1995). How to measure survey reliability and validity. London: Sage Publications.
Hoinville.G., Jowell, R. (1982). Survey Research Pratice. London:Heineman Educational Books.
Neale, J.M. & Liebert, R.M. (1973). Science and Behavior: An introduction to methods of research. N.J: Prentice-Hall Inc.
Mason, E.J. & Bramble, W.J. (1978). Understanding and conducting research. N.Y: McGraw-Hill Inc.
Drew, C.J. & Hardman, M.L. (1987). Designing and conducting behavioral research. N.Y: Pergamon Press.
Schwarz, N, Gorves, R. M., Schuman, H. (1998). Survey methods. In D. T. Gilbert, Fiske, S. T., & G. Lindzey (Eds.), The Handbook of Social Psychology (Vol. 1, p. 143- 179). New York: McGraw-Hill.
Leedy, P. D., & Ormrod, J. (2009). Practical research: Planning and design. New Jersey: Pearson Education.
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