Duke-Elder's practice of refraction / 
revised by David Abrams 
 - 10th ed. 
 - Edinburgh :  Churchill Livingstone,  1993 
 - 301 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0443038562 
<br/><br/><label>LCCN: </label>92-049141 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Refraction, Ocular