Gaya APA

CRESWELL, J, W., MUHAMMAD, A, K. (2003). Research design : qualitative, quantitative, and mixed method / John W. Creswell . Thousand Oaks: Sage Publications.

Gaya MLA

CRESWELL, John, W.., MUHAMMAD, Abdul, Kadir. "Research design : qualitative, quantitative, and mixed method / John W. Creswell". Thousand Oaks: Sage Publications, 2003. Text.