Capel, Vivian. <br/><br/>
Microphones in action / 
by Vivian Capel. 
 - Watford :  Fountain Press,  1978. 
 - 155 p :  ill. ;  21cm. 
<br/><br/><label>ISBN: </label>0852425120 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microphone.