Creswell, J. W. (2014). Research design: Qualitative, quantitative, and mixed methods approaches (Fourth edition, International student edition.). SAGE.
Chicago-Zitierstil (17. Ausg.)Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Fourth edition, International student edition. Los Angeles, Calif: SAGE, 2014.
MLA-Zitierstil (9. Ausg.)Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Fourth edition, International student edition. SAGE, 2014.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.