Gaya APA
Babbie, Earl. (1986).
The Practice of social research (4th ed.).
Belmont, California:
Wodsworth.
Gaya Chicago
Babbie, Earl.
The Practice of social research.
4th ed.
Belmont, California:
Wodsworth,
1986.
Text.
Gaya MLA
Babbie, Earl.
The Practice of social research.
4th ed.
Belmont, California:
Wodsworth,
1986.
Text.
Gaya Turabian
Babbie, Earl.
The Practice of social research.
4th ed.
Belmont, California:
Wodsworth,
1986.
Print.