Gaya APA
Creswell, John W.. (1988).
Research design: qualitative, quantitative, and mixed methods approaches .
America:
SAGE Publications, Inc.
Gaya Chicago
Creswell, John W..
Research design: qualitative, quantitative, and mixed methods approaches.
America:
SAGE Publications, Inc,
1988.
Text.
Gaya MLA
Creswell, John W..
Research design: qualitative, quantitative, and mixed methods approaches.
America:
SAGE Publications, Inc,
1988.
Text.
Gaya Turabian
Creswell, John W..
Research design: qualitative, quantitative, and mixed methods approaches.
America:
SAGE Publications, Inc,
1988.
Print.