Gerlach Vernon S <br/><br/>
Teaching and media : A systematic approach 

 - 2nd 
 - Englewood Cliffs    Prentice-Hall  1980 
 - x,420p. 
<br/><br/><label>ISBN: </label>0-13-891358-7 
<br/><br/><label>Source: </label>Textual