Hanan, Mack. Successful market penetration how to shorten the sales cycle by making the first sale the first time Mack Hanan. - New York, NY American Management Association c1987. - xii, 226 p. ill. 22 cm. Includes index. ISBN: 081445934X LCCN: 87047704 Subjects--Topical Terms: SellingSelling--Key accounts. LC Class. No.: HF5438.25 / .H353 1987 Dewey Class. No.: 658.8/105