Communications source book   
ed. by Sybil P. Parker. 
 - New York  McGraw-Hill Book Comapny  1987 
 - 359p. 
 - McGraw-Hill science reference series .
<br/><br/><label>ISBN: </label>0070455104 
<br/><br/><label>Dewey Class. No.: </label>621.38  / N877 "R"