Audio-visual handbook 
Ralph Cable 
 - 3rd ed. 
 - London,  University of London P.  c1968. 
 - 118 p.  illus.  22 cm. 
<br/><br/> Index 
<br/><br/><label>ISBN: </label>0340085428 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual education--Handbooks, manuals, etc.