Gaya APA
Vaus, David de. (2001).
Research design in Social Research .
London:
Sage Publications.
Gaya Chicago
Vaus, David de.
Research design in Social Research.
London:
Sage Publications,
2001.
Text.
Gaya MLA
Vaus, David de.
Research design in Social Research.
London:
Sage Publications,
2001.
Text.
Gaya Turabian
Vaus, David de.
Research design in Social Research.
London:
Sage Publications,
2001.
Print.