Gaya APA
GEE, V., GEE, J.
(2007).
Open Question Selling / GEE, Val , GEE, Jeff
.
America:
McGrawe-Hill.
Gaya MLA
GEE, Val., GEE, Jeff.
"Open Question Selling / GEE, Val , GEE, Jeff".
America:
McGrawe-Hill,
2007.
Text.