Boersma, Tom et al. <br/><br/>
Inside AUTOCAD release 12/ 
Boersma, Tom et al. 
 - New Delhi:  Prentice Hall of India,1995. 
<br/><br/><label>ISBN: </label>8120308247 
<br/><br/><label>Dewey Class. No.: </label>670.285  / BOE