BATES, J. R <br/><br/>
Principles of Voice & Data Communications 

 - Boston  McGraw-Hill Irwin,  2007. 
 - xxviii,782p.: ill. ; Figures  Index  23cm 
<br/><br/><label>ISBN: </label>978-0-07-225732-8 
<br/><br/><label>Dewey Class. No.: </label>621.382 BAT