Cassel, Don <br/><br/>
Learning Dos, word perfect 5.0, lotus1-2-3, and d base III plus 

 - New Jersey  Prenticehall  1990 
 - xii, 177p. 
<br/><br/><label>ISBN: </label>0139461612 
<br/><br/><label>Subjects--Index Terms: </label>Computer operating system  Computer programe 
<br/><br/><label>Dewey Class. No.: </label>005.268  / CAS