Gayler, Winston. <br/><br/>
Telephone voice transmission :  standards and measurement / 
Winston D. Gayler. 
 - Englewood Cliffs, N.J. :  Prentice Hall,  c1989. 
 - xvii, 221 p. :  ill. 
<br/><br/><label>ISBN: </label>0139027769 
<br/><br/><label>LCCN: </label>91015086     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone--Standards.