Gaya APA
Creswell, John W. (1994).
Research design : qualitative and quantitative approaches .
USA:
Sage Publication.
Gaya Chicago
Creswell, John W.
Research design : qualitative and quantitative approaches.
USA:
Sage Publication,
1994.
Text.
Gaya MLA
Creswell, John W.
Research design : qualitative and quantitative approaches.
USA:
Sage Publication,
1994.
Text.
Gaya Turabian
Creswell, John W.
Research design : qualitative and quantitative approaches.
USA:
Sage Publication,
1994.
Print.