Gayford, M. L. <br/><br/>
Electroacoustics :  microphones, earphones and loudspeaker / 
by M. L. Gayford 
 - London :  Newnes-Butterworths,  1970 
 - 289 p. :  ill. ;  24 cm. 
 - STC Monograph .
<br/><br/><label>ISBN: </label>0408000260 
<br/><br/><label>LCCN: </label>77-125015 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electro-acoustics<br/>Microphone<br/>Loudspeakers