Werz, Edward W. The Complete Customer Service Letter Book/ Werz,Edward W. - United States : McGrow-Hill, 1993 - 290 p : 23.5 cm. Index. ISBN: 0-07-911618-3 Subjects--Topical Terms: Comercial correspondenceCustomer service--United States. Dewey Class. No.: 651.75 / W499C 1993