Creswell, J. W. (2015). Educational research: Planning, conducting, and evaluating quantitative and qualitative research (5ª edición.). Pearson.
Chicago-Zitierstil (17. Ausg.)Creswell, John W. Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research. 5ª edición. Upper Saddle River, NJ: Pearson, 2015.
MLA-Zitierstil (9. Ausg.)Creswell, John W. Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research. 5ª edición. Pearson, 2015.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.