Burton, David M Elementary number theory / David M. Burton. - 6th ed. - Dubuque, Iowa : Wm. C. Brown Publishers 2007 - xiii, 434p.:ill. 25cm. Includes bibliographical references and index. ISBN: 9780071244251 LC Class. No.: QA241 .B83 2007 Dewey Class. No.: QA241 .B83 2007 National Library of Medicine Call No.: QA241 .B83 2007