Weinberg, Gabriel Traction : How any startup can achieve explosive customer growth / Gabriel Weinberg, Justin Mares. - New York : Portfolio Penguin, c2015. - xiii, 222 p. ; 23 cm. ISBN: 9780241242537 Subjects--Topical Terms: New business enterprises. Success in business. Customer relations. Dewey Class. No.: 658.11 / WEI