Instructional process and media innovation 
Robert A. Weisgerber 
 - Chicago:  Rand Mcnally,  1968. 
 - xi,569p. 
<br/><br/> HB 
<br/><br/><br/>Eng 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual education
<br/><br/><label>Dewey Class. No.: </label>371.39  / WEI