Ruff, Laura. <br/><br/>
Understanding and using MS-DOS / PC DOS :  the first steps / 
by Laura Ruff, Mary Weitzer. 
 - St.Paul, Id. :  West Publ. Comp.,  1989. 
 - xix, 118 p., I-3 
 - The Microcomputing Series. .
<br/><br/><label>ISBN: </label>0314503307 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer science.<br/>MS-DOS (Computer operating system).