Gaya APA
Creswell, John W.. (1994).
Research Design... .
London:
Sage Publications,.
Gaya Chicago
Creswell, John W..
Research Design....
London:
Sage Publications,,
1994.
Text.
Gaya MLA
Creswell, John W..
Research Design....
London:
Sage Publications,,
1994.
Text.
Gaya Turabian
Creswell, John W..
Research Design....
London:
Sage Publications,,
1994.
Print.