References 

1. Bromley DB. The case-study method in psychology and related disciplines. Chichester, UK: John Wiley & Sons; 1986;
2. Merriam SB. Case study research in education. San Franciso: Jossey-Bass Inc.; 1991;
3. Stake RE. The art of case research. Thousand Oaks, CA: Sage Publications; 1995;
4. Yin R. Case study research: design and methods. 3rd ed.. Thousand Oaks, CA: Sage Publications; 2003;
5. Yin R. Case study research: design and methods. 4th ed.. Thousand Oaks, CA: Sage Publications; 2008;
6. Travers M. Qualitative research through case studies. London: Sage; 2001;
7. Yin R. Case study research: design and methods. 2nd ed.. Thousand Oaks, CA: Sage Publications; 1994;
8. Carroll JS, Johnson EJ. Decision research: a field guide. Newbury Park, CA: SAGE Publications; 1990;
9. Grbich C. Qualitative research in health. Sydney: Allen and Unwin; 1999;
10. In:  Denzin NK,  Lincoln YS editor. The sage handbook of qualitative research. 3rd ed.. London: Sage Publications; 2005;