Groff, James R. <br/><br/>
Understanding UNIX :  a conceptual guide / 
James R. Groff, Paul N. Weinberg 
 - 2nd ed. 
 - Singapore :  Tech,  1988 
 - 234 p. ;  21 cm. 
<br/><br/><label>LCCN: </label>88-060156 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MS-DOS (Computer file)