Gaya APA
COOPER, D, R., SCHINDLER, P, S.
(2008).
Business research methods
(
10th Ed.)
.
Singapore:
McGraw Hill.
Gaya MLA
COOPER, Donald, R.., SCHINDLER, Pamela, S..
"Business research methods".
10th Ed.
Singapore:
McGraw Hill,
2008.
Buku.