Wagner, Leslie, 1943- <br/><br/>
The economics of educational media / 
Leslie Wagner 
 - London :  MacMillan,  1982 
 - x,162 p.  23 cm. 
<br/><br/>Bibliography: p152-157. - Includes index 
<br/><br/><label>ISBN: </label>0333316908 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio--visual education--Economic aspects