The impact of educational television :  selected studies from the research / 
sponsored by The National Educational Television and Radio Center ; ed. Center by Wilbur Schramm. 
 - Urbana, E.U.A. :  University of Illinois,  1960. 
 - 247 p. 
<br/><br/><label>Encabezamiento--Tema: </label><br/>Televisión en la educación