Haas, Kenneth Brooks. <br/><br/>
Preparation and use of audio-visual aids / 
Kenneth Brooks Haas and Harry Q. Packer. 
 - 3rd ed. 
 - New York :  Prentice-Hall,  1955 
 - xii, 381 p. :  ill. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>92  92 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Methods of instruction and study.
<br/><br/><label>Dewey Class. No.: </label>371.33 / H111p