Grupe, Fritz H. Using WordPerfect 5.1, Lotus 1-2-3/version 3.0, and dBase IV / Fritz H. Grupe, Kerry J. Chase. - Dubuque, IA : W.C. Brown Publishers, c1992. - 1 v. (various pagings) ; Includes indexes. ISBN: 0697133419 Subjects--Topical Terms: Application software. Dewey Class. No.: 005.3 / GRU