Oppenheim , Alan V. ; Schafer , Ronald W. ; Buck , John R.  <br/><br/>
Discrete-time signal processing 

 - 2nd. ed.  
 - New Delhi  Dorling Kindersley  1999. 
 - 888 p. 
<br/><br/> It has few pen marks in the begining chapter but rest of the sections are brand new. 
<br/><br/><label>ISBN: </label>8131704920 (paperback) 9788131704929 (paperback) 
<br/><br/><label>Source: </label> 830.00 PKR