The art of nonverbal selling let your customers' unspoken signals lead you to the close / [Book] :
Gerhard Gschwandtner.
- New York : McGraw-Hill, c2007.
- xi, 242 p. : ill. ; 25 cm. + 1 CD ROM (4 3/4 in.).
At head of title: Selling power. Accompanying DVD is encoded for all regions.