Gaya APA
Creswell, John W.. (2003).
Research Design, Second Edition (edisi 2).
USA:
SAGE PUBLICATIONS.
Gaya Chicago
Creswell, John W..
Research Design, Second Edition.
edisi 2
USA:
SAGE PUBLICATIONS,
2003.
.
Gaya MLA
Creswell, John W..
Research Design, Second Edition.
edisi 2
USA:
SAGE PUBLICATIONS,
2003.
.
Gaya Turabian
Creswell, John W..
Research Design, Second Edition.
edisi 2
USA:
SAGE PUBLICATIONS,
2003.
.