Cita APA (7th ed.)

Creswell,John W. (2011). Research design: Qualitative, quantitative, and mixed methods approaches (3rd.). Sage.

Cita Chicago (17th ed.)

Creswell,John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 3rd. New Delhi: Sage, 2011.

Cita MLA (9th ed.)

Creswell,John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 3rd. Sage, 2011.