Gaya APA
COOPER, D, R., SCHINDLER, P, S.
(2006).
Business research methods
(
8th ed.)
.
Boston:
McGraw-Hill Irwin.
Gaya MLA
COOPER, Donald, R.., SCHINDLER, Pamela, S..
"Business research methods".
8th ed.
Boston:
McGraw-Hill Irwin,
2006.
Buku.