Gaya APA

Creswell, J, C., , . (2009). Research design: qualitative, quantitative, and mixed methods approaches . Los Angeles; SAGE, 2009: Los Angeles; SAGE, 2009.

Gaya MLA

Creswell, John, C., , . "Research design: qualitative, quantitative, and mixed methods approaches". Los Angeles; SAGE, 2009: Los Angeles; SAGE, 2009, 2009. .