Gaya APA
LOCKER, K, O., KACZMAREK, S, K.
(2009).
Business communication:
(
4th ed.)
.
Singapore:
McGraw-Hill.
Gaya MLA
LOCKER, Kitty, O.., KACZMAREK, Stephen, Kyo.
"Business communication:".
4th ed.
Singapore:
McGraw-Hill,
2009.
Buku.