Creswell, J. W. (2015). Research design: Qualitative, quantitative, and mixed methods approaches. Sage.
Παραπομπή Chicago StyleCreswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Sage, 2015.
Παραπομπή MLACreswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Sage, 2015.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.