The economics of new educational media :  present status of research and trends 

 - Paris :  Unesco,  1977 
 - 200 p. :  ill. ;  25 cm. 
 - Educational methods and techniques .
<br/><br/><label>ISBN: </label>9231014234 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology