McKonw Harry C <br/><br/>
Audio-visual aids to instruction 

 - 2 
 - New York, USA  McGraw-Hill Book Company  1949 
 - xvi,608p 
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching Aids; Audio - Visual Materials