681.3.06Ingalsbe, Lon S WordPerfect 5.0: Workbook and Reference / [aut.]Ingalsbe,Lon S., Simonson,Brent D. -- Homewood : Richard D.Irwin, 1990. -- 537 s : Tab.,grafy,index. -- ISBN : 0-256-08203-0. Simonson, Brent D