Gaya APA
Creswell, J, W. (2003).
Research Design : Qualitative, Quantitative, And Mixed Methods Approaches (Cet.2).
New delhi:
Sage Publications.
Gaya MLA
Creswell, John, W..
"Research Design : Qualitative, Quantitative, And Mixed Methods Approaches".
Cet.2
New delhi:
Sage Publications,
2003.
Text.