Creswell, J. W. (2015). Research design: Qualitative, quantitative, and mixed methods approaches. Sage.
استشهاد بنمط شيكاغوCreswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Sage, 2015.
MLA استشهادCreswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Sage, 2015.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.