Gaya APA
Vaus, D.A. de. (1991).
Surveys in Social Research (3rd ed.).
Australia:
Allen & Unwin.
Gaya Chicago
Vaus, D.A. de.
Surveys in Social Research.
3rd ed.
Australia:
Allen & Unwin,
1991.
Text.
Gaya MLA
Vaus, D.A. de.
Surveys in Social Research.
3rd ed.
Australia:
Allen & Unwin,
1991.
Text.
Gaya Turabian
Vaus, D.A. de.
Surveys in Social Research.
3rd ed.
Australia:
Allen & Unwin,
1991.
Print.