Green, J., & Thorogood, N. (2018). Qualitative methods for health research. Sage. Chapter 1-11, pluss chapter 13.
Additional articles
Braun & Clarke (2006). Using thematic analysis in psychology. Qual Research Psychol 3: 77-101.
http://www.tandfonline.com/doi/pdf/10.1191/1478088706qp063oa
Halkier, B. (2010). Focus groups as social enactments: integrating interaction and content in the analysis of focus group data. Qualitative Research, 10(1), 71-89. doi:10.1177/1468794109348683
https://journals.sagepub.com/doi/10.1177/1468794109348683
Malterud et al (2016). Sample size in qualitative interview studies: Guided by information power. Qual Health Research 26: 1753-60. https://journals.sagepub.com/doi/10.1177/1049732315617444
Additional book chapters
Moen, K., & Middelthon, A. L. (2015). Qualitative research methods. In Research in medical and biological sciences (pp. 321-378). Academic Press.
Wetherell, M., Taylor, S., & Yates, S. J. (2001). Discourse Theory and Practice. A Reader. (pp. 1-81). Los Angeles: Sage.