Gaya APA
LOCKER, K, O., KACZMAREK, S, K.
(2007).
Business communication:
(
3th ed.)
.
Singapore:
McGraw-Hill.
Gaya MLA
LOCKER, Kitty, O.., KACZMAREK, Stephen, Kyo.
"Business communication:".
3th ed.
Singapore:
McGraw-Hill,
2007.
Buku.