Gaya APA
Vaus, D.A. de. (1985).
Surveys in social research .
Sydney:
Allen & Unwin Pty Ltd.
Gaya Chicago
Vaus, D.A. de.
Surveys in social research.
Sydney:
Allen & Unwin Pty Ltd,
1985.
Text.
Gaya MLA
Vaus, D.A. de.
Surveys in social research.
Sydney:
Allen & Unwin Pty Ltd,
1985.
Text.
Gaya Turabian
Vaus, D.A. de.
Surveys in social research.
Sydney:
Allen & Unwin Pty Ltd,
1985.
Print.