Gaya APA
NEUMAN, W, L., LASSER, J, [.
(2006).
Social reserch methods :
(
6th ed.)
.
Boston:
Person.
Gaya MLA
NEUMAN, W., Lawrence., LASSER, Jeff, [ed.].
"Social reserch methods :".
6th ed.
Boston:
Person,
2006.
Buku.