Creswell, J. W. (1994). Research design: Qualitative & quantitative approaches. Sage.
Cita Chicago Style (17a ed.)Creswell, John W. Research Design: Qualitative & Quantitative Approaches. Thousand Oaks, California: Sage, 1994.
Cita MLA (9a ed.)Creswell, John W. Research Design: Qualitative & Quantitative Approaches. Sage, 1994.
Precaución: Estas citas no son 100% exactas.