Creswell, J. W. 4. (1994). Research design: Qualitative and quantitative approaches. London : Sage Publications.
Chicago-referens (17:e uppl.)Creswell, John W. 401571. Research Design: Qualitative and Quantitative Approaches. London : Sage Publications, 1994.
MLA-referens (9:e uppl.)Creswell, John W. 401571. Research Design: Qualitative and Quantitative Approaches. London : Sage Publications, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.