Humphrey, Doris. Customer service / Doris D. Humphrey. - 2nd ed. - Mason, OH : South-Western Cengage Learning, c2011. - x, 182 p. : col. ill. ; 28 cm. - 21st century business series . Includes index. ISBN: 9780538494229 : US$48.00 0538494220 LCCN: 2009941947 Subjects--Topical Terms: Customer services.Customer relations.Customer services.Customer relations. LC Class. No.: HF5415.5 / .H86 2011