Bretz, Rudolf. <br/><br/>
A taxonomy of communication media 
[by] Rudy Bretz. 
 - Englewood Cliffs, N.J.  Educational Technology Publications  [1971] 
 - xxiv, 168 p.  illus.  24 cm. 
 - A Rand Corporation research study .
 - Rand Corporation research study. .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0877780129 
<br/><br/><label>LCCN: </label>72125874 //r86 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mass media
<br/><br/><label>LC Class. No.: </label>P90  / .B68 
<br/><br/><label>Dewey Class. No.: </label>301.161