Rita and Sheila Udall. <br/><br/>
People and communication/ 
Rita and Sheila Udall 
 - UK.  Educational Publication ltd.  1982 
 - 172p. 
<br/><br/><label>ISBN: </label>0717508323 
<br/><br/><label>LC Class. No.: </label>HF5726  / .Ud1 1971