AstinA. W. (1984). Student involvement: A developmental theory for higher education. Journal of College Student Personnel, 25, 297-308.
2.
CreswellJ. W. (2003). Research design: Qualitative, quantitative, and mixed-methods approaches (2nd ed.). Thousand Oaks, CA: Sage.
3.
CreswellJ. W. (2009). Research design: Qualitative, quantitative, and mixed-methods approaches (3rd ed.). Thousand Oaks, CA: Sage.
4.
JonesS. R., & AmesE. S. (2010). The nature and uses of theory. In SchuhJ. H.JonesS. R. & HarperS. R. (Eds.), Student services: A handbook for the profession (pp. 149–167). San Francisco, CA: Jossey-Bass.
5.
MaxwellJ. A. (2005). Qualitative research design: An interactive approach. Thousand Oaks, CA: Sage.
6.
MerriamS. B. (1998). Qualitative research and case study applications in education. San Francisco, CA: Jossey-Bass.
7.
NeumanW. L. (2000). Social research methods: Qualitative and quantitative approaches (4th ed.). Boston, MA: Allyn and Bacon.
8.
StraussA., & CorbinJ. M. (1998). Basics of qualitative research: Techniques and procedures for developing grounded theory. Thousand Oaks, CA: Sage.