Strauss, Anselm C. and Corbin, Juliet M. 1990. Basics of Qualitative Research. Techniques and Procedures for Developing Grounded Theory. London, Thousand Oaks, New Dehli: Sage.
Strauss, Anselm C. and Corbin, Juliet M. 1990. Basics of Qualitative Research. Techniques and Procedures for Developing Grounded Theory. London, Thousand Oaks, New Dehli: Sage.