Wittich, Walter Arno et al. <br/><br/>
Material audiovisual  :  Su naturaleza y utilizacion 
/ Walter Arno Wittich / coaut. Charles Francis Schuller 
 - Mexico  : Pax-Mexico  , c1965. 
 - 509 p. pb.  : il. maps. retrs. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educación---Material audio visual
<br/><br/><label>Dewey Class. No.: </label>371.33 WIT