Gaya APA
BABBIE, E. (1986).
The Practice Of SOCIAL REEARCH (4).
United Sates of Ameica:
CALIFORNIA INSTITUTE OF TECHNOLOGY.
Gaya MLA
BABBIE, EARL.
"The Practice Of SOCIAL REEARCH".
4
United Sates of Ameica:
CALIFORNIA INSTITUTE OF TECHNOLOGY,
1986.
Text.