Gaya APA
COOPER, D, R., SCHINDLER, P, S.
(2009).
Business research methods
(
10th ed.)
.
Singapore:
McGraw Hill.
Gaya MLA
COOPER, Donald, R.., SCHINDLER, Pamela, S..
"Business research methods".
10th ed.
Singapore:
McGraw Hill,
2009.
Buku.