Gaya APA
COOPER, D, R., SCHINDLER, P, S.
(2011).
Business research methods
(
11th ed.)
.
Singapore:
McGraw Hill.
Gaya MLA
COOPER, Donald, R.., SCHINDLER, Pamela, S..
"Business research methods".
11th ed.
Singapore:
McGraw Hill,
2011.
Buku.