Cashell, G. T. Willoughby <br/><br/>
Handbook of orthoptic principles  / 
by G. T. Willoughby Cashell, Isobel M. Durran ; assisted by A. V. MacLellan foreword by T. Keith Lyle 
 - 4th ed. 
 - Edinburgh :  Churchill Livingstone,  1980 
 - 168 p. :  ill. ;  22 cm. 
<br/><br/><label>ISBN: </label>0443022003 
<br/><br/><label>LCCN: </label>80-040527 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Orthoptics