Gaya APA
Babbie, Earl R.. (1973).
Survey Research Methods .
Belmont, California:
Wadsworth.
Gaya Chicago
Babbie, Earl R..
Survey Research Methods.
Belmont, California:
Wadsworth,
1973.
Text.
Gaya MLA
Babbie, Earl R..
Survey Research Methods.
Belmont, California:
Wadsworth,
1973.
Text.
Gaya Turabian
Babbie, Earl R..
Survey Research Methods.
Belmont, California:
Wadsworth,
1973.
Print.