The Economics of new educational media. 

 - Paris :  UNESCO,  1977-1980. 
 - 3 v ; 
<br/><br/><label>ISBN: </label>9231014234 (pbk. : v. 1) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational technology.
<br/><br/><label>Dewey Class. No.: </label>371.3078  / Ec