Gerlach Vernon S <br/><br/>
Teaching And Media A Systematic Approach Vernon S Gerlach Donald P Ely With The Assistance Of Rob Melnick 

 -  Englewood Cliffs N.J : Prentice-Hall C1980 
 - 392 
<br/><br/><br/>Eng 
<br/><br/><label>ISBN: </label>0138913331(Hbk)