Using WordPerfect 5.1 /   Textual Documents 
NULL. 
 - New Delhi :   Prentice Hall of India ,   1989. 
 - NULL ;   NULL. 
<br/><br/><label>Subjects--Index Terms: </label>WordPerfect 5.1 Software packages 
<br/><br/><label>Dewey Class. No.: </label>005.369  / USI