1. Grounded theory—collection and analysis of qualitative data in a preliminary research investigation;Boland,1988
2. The Research Act;Denzin,1978
3. The Discovery of Grounded Theory: Strategies for Qualitative research;Glaser,1967
4. Health promotion. What is it? What will it become?;Green;Health Promotion,1988
5. Effective Evaluation;Guba,1981