Interviewen: theorie, techniek en training. Groeningen: Wolters-Noordhoff; 1986.
Participant observation. New York: Holt, Rinehart and Winston; 1980.
Clinical epidemiology: a basic science for clinical medicine. 2 nd ed. Boston: Little, Brown; 1991.
Cochrane Handbook for Systematic Reviews of Interventions. Version 5.1.0 ed. Oxford (UK): The Cochrane Collaboration; 2011.
Collecting and interpreting qualitative materials. Thousand Oaks, Calif.: Sage Publications; 2008.
Conducting in-depth interviews: a guide for designing and conducting in-depth interviews for evaluation input . Watertown, USA: Pathfinder International; 2006.
Interpreting Qualitative Data. London: SAGE Publications; 2011.
The interview: from neutral stance to political involvement. Fontana A, Frey JH, eds. Thousand Oaks: Sage; 2005.
Keywords in qualitative methods. A vocabulary of research concepts. Thousand Oaks: Sage; 2006.
L'analyse qualitative en sciences humaines et sociales. Paris: Armand Colin; 2011.
The landscape of qualitative research. Los Angeles: Sage Publications; 2008.
Modern epidemiology. 2 nd ed. Philadelphia, PA: Lippincott & Raven; 1998.
Practical statistics for medical research. Chapman and Hall/CRC; 1990.
Qualitative Data Analysis: A User-Friendly Guide For Social Scientist. London: Routledge; 1993.
Qualitative data analysis: an expanded sourcebook. Beverly Hills, CA: Sage Publications; 1994.
Qualitative inquiry and research design. Choosing among five traditions.. London: Sage publications; 1998.
Qualitative methods for health research. Sage Publications; 2004.
Qualitative research & evaluation methods. Thousand Oaks: Sage; 2002.
Qualitative research and case study applications in education. San Francisco: Jossey-Bass; 1998.
Qualitative research and evaluation methods: integrating theory and practice. 4th ed. Thousand Oaks, California: SAGE Publications Ltd; 2015.
Qualitative research in health care. Blackwell Pub./BMJ Books; 2006.
Qualitative research methods: a data collector's field guide. North Carolina, USA: Family Health International; 2005.
Reliability and validity in qualitative research. Vol. 1. London: Sage; 1986. Qualitative Research Methods Series 1.