Creswell, J. W., & Creswell, J. D. (2018). Research design: Qualitative, quantitative, and mixed methods approaches. Los Angeles: Sage.
Παραπομπή Chicago StyleCreswell, John W., και J. David Creswell. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Los Angeles: Sage, 2018.
Παραπομπή MLACreswell, John W., και J. David Creswell. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Los Angeles: Sage, 2018.
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