Khanna, P N <br/><br/>
Audio -visual training materials  a source book 

 - New Delhi  National council of educational research and training  1971 
 - 199 p.; 16cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio visual education<br/>Audio visual training materials - education<br/>Education - audio visual aids<br/>Educational technology<br/>Instructural technology