Gaya APA
Eitzen, D, S., Zinn, M, B.
(1989).
Social problems
(
4th ed)
.
Boston:
Allyn and Bacon.
Gaya MLA
Eitzen, D., Stanley., Zinn, Mixine, Baca.
"Social problems".
4th ed
Boston:
Allyn and Bacon,
1989.
Text.