APA Citation

 Couch, L. W. (2013).  Digital and analog communication system.  Pearson.

Chicago Style Citation

 Couch, Leon W.  Digital and Analog Communication System.  Pearson, 2013.

MLA Citation

 Couch, Leon W.  Digital and Analog Communication System.  Pearson, 2013.

Warning: These citations may not always be 100% accurate.