Creswell, J. W. Research design: Qualitative, quantitative, and mixed methods approaches (6th ed.). SAGE Publications.
Chicago-Zitierstil (17. Ausg.)Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 6th ed. Los Angeles: SAGE Publications.
MLA-Zitierstil (9. Ausg.)Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 6th ed. SAGE Publications.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.