Gaya APA

Creswell, J, W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (Ed. Ke-4). Singapore: Singapore.SAGE Publications ..

Gaya MLA

Creswell, John, W.. "Research Design: Qualitative, Quantitative, and Mixed Methods Approaches". Ed. Ke-4 Singapore: Singapore.SAGE Publications ., 2014. Koleksi Elektronik.