Erickson, Fritz J. <br/><br/>
Computers--concepts, implications, and applications with DOS 5.0, WordPerfect 5.1, Lotus 1-2-3, Release 2.4, and dBASE IV 1.5 / 
Fritz J. Erickson, John A. Vonk. 
 - Dubuque:  Business and Educational Technologies,  1994. 
 - xvi, [various pagination] :  ill. ;  28 cm.  
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0697239519 (pbk. ) 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Microsoft Windows (Computer file).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Integrated software.<br/>Operating systems (Computers).