Babbie, Earl. (2000). The practice of social research
(9th ed.). Belmont, CA: Wadsworth
Cooper, D. R., & Schindler, P. S. (2000). Business
research methods (7th ed.). Boston, MA: McGraw-Hill Irwin.
Cresswell, John W. (1994). Research design: Quantitative
and qualitative methods. Thousand Oaks, CA: Sage.
Davis, D. (2000). Business research for decision making
(5th ed.). Pacific Grove, CA: Duxbury.
Gall, M. D., Borg, W. R., & Gall, J. P. (1996).
Educational research: An introduction, (6th ed.). White Plains, NY:
Longman.
Leedy, P. D. & Ormrod, J. E. (2001). Practical research:
Planning and design (7th ed.). Upper Saddle River, NJ: Merrill Prentice-Hall.
Martella, R. C., Nelson, R., & Marchand-Martella,
N. E. (1999). Research methods: Learning to become a critical research
consumer. Needham Heights, MA: Allyn & Bacon.