Gaya APA
CALLENBACH, I., LERVEN, V, F.
(2004).
Simply Selling
(
1)
.
:
Gramedia Pustaka Utama.
Gaya MLA
CALLENBACH, Ingrid., LERVEN, Van, Frank.
"Simply Selling".
1
:
Gramedia Pustaka Utama,
2004.
Textbook.