Gaya APA
Babbie, Earl R.. (1979).
The practice of social research .
California:
Wadsworth.
Gaya Chicago
Babbie, Earl R..
The practice of social research.
California:
Wadsworth,
1979.
Text.
Gaya MLA
Babbie, Earl R..
The practice of social research.
California:
Wadsworth,
1979.
Text.
Gaya Turabian
Babbie, Earl R..
The practice of social research.
California:
Wadsworth,
1979.
Print.