Gaya APA
BABBIE, E., RUBIN, A.
(2001).
Research methods for social work
(
4th ed)
.
Belmont, USA:
Wadsworth.
Gaya MLA
BABBIE, Earl., RUBIN, Allen.
"Research methods for social work".
4th ed
Belmont, USA:
Wadsworth,
2001.
Book.