Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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