W .A Douthwate <br/><br/>
CONTACT LENS OPTICS & LENS DESIGN 

 - Third Edition 
 -  Butterworth -Heinemann  
 - 420 
<br/><br/><label>ISBN: </label>0-7506-8879-3 
<br/><br/><label>Dewey Class. No.: </label>617.7523