Gaya APA
Schiffman, S., Puspitorini, I.
(2006).
The 250 Sales Questions to Close The Deal
.
Jakarta:
Imagepress.
Gaya MLA
Schiffman, Stephen., Puspitorini, Ira.
"The 250 Sales Questions to Close The Deal".
Jakarta:
Imagepress,
2006.
Text.