Date, C. J. An introduction to database systems / C.J. Date. - 6th ed. - Reading, Mass. : Addison-Wesley Pub. Co., c1995. - xxiii, 839 p. : ill. ; 25 cm. - Systems programming series . - Addison-Wesley systems programming series. . Includes bibliographical references and index. ISBN: 020154329X Subjects--Topical Terms: Database management.