Creswell, J. W. (2012). Educational Research: Planning, conducting, and evaluating quantitative and qualitative research (4th ed.). Pearson.
Chicago-Zitierstil (17. Ausg.)Creswell, John W. Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research. 4th ed. Noida: Pearson, 2012.
MLA-Zitierstil (9. Ausg.)Creswell, John W. Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research. 4th ed. Pearson, 2012.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.