Selden, Larry Angel customers & demon customers : discover which is which and turbo-charge your stock / Larry Selden and Geoffrey Colvin - New York : Portfolio, c2003. - x, 243 p. ; ill. ; 24 cm. ISBN: 9781591840077 LCCN: Subjects--Topical Terms: Customer relations LC Class. No.: HF5415.5 / .S449 2003