Callahan, Mike. <br/><br/>
Dr. File Finder's guide to shareware / 
Mike Callahan, Nick Anis. 
 - New York :  Osborne McGraw-Hill,  1990. 
 - xxxii, 1019 P. 
<br/><br/><label>ISBN: </label>0078816467 
<br/><br/><label>LCCN: </label>92014041     
<br/><br/><label>Subjects--Topical Terms: </label><br/>IBM Personal Computer--Programming.<br/>Computer software.
<br/><br/><label>Subjects--Index Terms: </label>Shareware