Autocad :   manual de referencia /  
Nelson Johnson 
 - 1a. ed. 
 - Madrid :  Osborne-Mc Graw-Hill,  1992 
 - 774 p. :    774 p. ; ilus. ;    24 cm. 
<br/><br/><label>ISBN: </label>8476154518 
<br/><br/><label>Subjects--Index Terms: </label>AUTOCAD 
<br/><br/><label>LC Class. No.: </label> / J 61 
<br/><br/><label>Universal Decimal Class. No.: </label>800.92 A (