Wittich, Walter A. <br/><br/>
Instructional technology :  its nature and use / 
Walter A. Wittich, Charles F. Schuller. 
 - 6th ed. 
 - New York :  Harper & Row,  1979. 
 - 331 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0060471697 
<br/><br/><label>LCCN: </label>78-12812 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual education.