Coppen, Helen Elizabeth,  <br/><br/>
Survey of British research in audio-visual aids/ 
compiled by Helen E. Coppen. 
 - Educational Foundation  for Visual Aids, London:  National Committee for Audio-Visual Aids in Education.  1968. 
 - 163 pages ;   22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio--visual education--Great Britain--Bibliography.<br/>Audio--visual education--Great Britain--Abstracts.