Tracy, S. J. (2019). Qualitative research methods: Collecting evidence, crafting analysis, communicating impact. 2nd ed. Wiley-Blackwell.
Neuendorf, K. A. (2017). The Content analysis guidebook. SAGE publications.
Hayashi, P., Abib, G., & Hoppen, N. (2019). Validity in Qualitative Research: A Processual Approach. The Qualitative Report
Creswell, J.W., Creswell, J. D. (2021) Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. SAGE publishing
Creswell, J. W., & Guetterman, T. C. (2019). Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research. Pearson.
Creswell, J.W., Creswell J.D. (2018). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches 5th ed. SAGE Publications.
Bryman, A. (2015). Social Research Methods, Oxford, OUP.: