Creswell, J. W. (1994). Research design: Qualitative & quantitative approaches. Sage Publications.
Chicago Style (17. basım) AtıfCreswell, John W. Research Design: Qualitative & Quantitative Approaches. Thousand Oaks, Calif.: Sage Publications, 1994.
MLA (8th ed.) AtıfCreswell, John W. Research Design: Qualitative & Quantitative Approaches. Sage Publications, 1994.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..