Gaya APA
Babbie, Earl R.. (1973).
Survey research methods .
Belmont:
Wadsworth Publishing Company.
Gaya Chicago
Babbie, Earl R..
Survey research methods.
Belmont:
Wadsworth Publishing Company,
1973.
.
Gaya MLA
Babbie, Earl R..
Survey research methods.
Belmont:
Wadsworth Publishing Company,
1973.
.
Gaya Turabian
Babbie, Earl R..
Survey research methods.
Belmont:
Wadsworth Publishing Company,
1973.
.