APA aipamena

Creswell, J. W. (1994). Research design: Qualitative & quantitative approaches. Sage.

Chicago Style aipamena

Creswell, John W. Research Design: Qualitative & Quantitative Approaches. Thousand Oaks, California: Sage, 1994.

MLA aipamena

Creswell, John W. Research Design: Qualitative & Quantitative Approaches. Sage, 1994.