Schiffman, Stephen The 250 power words that sell : the words you need to get the sale, beat your quota, and boost your commission / Stephen Schiffman. - Avon, MA: Adams Media, c2013. - 224 p. ; 22 cm. Includes appendix and index. ISBN: 978-1-4405-5625-8 (pbk.) Subjects--Topical Terms: Selling.