Gaya APA
Creswell, John W. (1994).
Research design qualitative & quantitative approaches .
California:
Sage Publications.
Gaya Chicago
Creswell, John W.
Research design qualitative & quantitative approaches.
California:
Sage Publications,
1994.
Buku Text.
Gaya MLA
Creswell, John W.
Research design qualitative & quantitative approaches.
California:
Sage Publications,
1994.
Buku Text.
Gaya Turabian
Creswell, John W.
Research design qualitative & quantitative approaches.
California:
Sage Publications,
1994.
Buku Text.