Gaya APA
BABBIE, E.
(1983).
The practical of social research
(
0-534-01255-8)
.
Belmont, California:
Wadsworth.
Gaya MLA
BABBIE, Earl.
"The practical of social research".
0-534-01255-8
Belmont, California:
Wadsworth,
1983.
Buku.