Gerlach, Vernon S.,    1922- <br/><br/>
Teaching and media :    a systematic approach /  
Vernon S. Gerlach , Donald P. Ely, with the assistance of Rob Melnick. 
 - 2nd ed. 
 - Englewood Cliffs, N.J. :    Prentice-Hall,    c1980. 
 - x, 420 p. :    ill. ;    24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0138913587 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Audio-visual education.<br/> Teaching -- Aids and devices.
<br/><br/><label>Dewey Class. No.: </label>371.3