1. Research design: qualitative, quantitative, and mixed methods approaches Creswell, John W., Los Angeles, California ; SAGE Publications, Inc., [2023] SW510 PSY510 CP607 SOC221
2. Qualitative inquiry & research design: choosing among five approaches Creswell, John W, Thousand Oaks, California : Sage, [2025] SOC221
3. Qualitative inquiry & research design: choosing among five approaches Creswell, John W. Thousand Oaks : Sage Publications, c2007. SOC221
4. Single-case research designs: methods for clinical and applied settings Kazdin, Alan E. New York ; Oxford University Press, 2011. CP607
