Gaya APA
de Vaus, D.A.. (1990).
Surveys in social research. (2nd.Ed.).
London:
Unwin Hyman.
Gaya Chicago
de Vaus, D.A..
Surveys in social research..
2nd.Ed.
London:
Unwin Hyman,
1990.
Text.
Gaya MLA
de Vaus, D.A..
Surveys in social research..
2nd.Ed.
London:
Unwin Hyman,
1990.
Text.
Gaya Turabian
de Vaus, D.A..
Surveys in social research..
2nd.Ed.
London:
Unwin Hyman,
1990.
Print.