Gaya APA

Gee, J., Gee, V. (2007). Open question selling : unlock your customer's needs to close the sale... by knowing what to ask and when to ask it . : McGraw-Hill.

Gaya MLA

Gee, Jeff., Gee, Val. "Open question selling : unlock your customer's needs to close the sale... by knowing what to ask and when to ask it". : McGraw-Hill, 2007. Textbook.