Bandura, A. (2006). Toward a psychology of human agency. Perspectives on Psychological Science, 1(2), 164-180.
2.
Greene, J.C. (2007). Mixed methods in social inquiry. San Francisco: Jossey-Bass.
3.
Onwuegbuzie, A.J., & Johnson, R.B. (2006). The validity issue in mixed research. Research in the Schools, 131, 48-63. Retrieved March 23, 2008, from http://www.msera.org/Rits_131/Onwuegbuzie_Johnson_131.pdf
4.
Patton, M.Q. (2002). Qualitative research and evaluation methods. Thousand Oaks, CA: Sage.