Duff, Jon M. <br/><br/>
Sketching for engineering design visualization / 
Jon M. Duff, William A. Ross 
 - Clifton Park, NY :  Cengage Learning,  c2009 
 - 291 p. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>143545362X 9781435453623 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering drawings<br/>Freehand technical sketching