Gaya APA
Vaus, D, D.
(2001).
SURVEYS IN SOCIAL RESEARCH
(
4TH)
.
6 Bonhill Street London EC2A 4:
SAGE Publications.
Gaya MLA
Vaus, David, De.
"SURVEYS IN SOCIAL RESEARCH".
4TH
6 Bonhill Street London EC2A 4:
SAGE Publications,
2001.
Text.