Wittich Walter Arno <br/><br/>
Audio-visual materials: Their nature and use 

 - 3rd 
 - New York, USA  Harper and Brothers  1962 
 - xxvi,500p 
 - Exploration series in education .
<br/><br/><label>Source: </label>TextBook 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching aids materials