Chaffey, Dave, <br/><br/>
Digital marketing excellence :  planning, optimizing and integrating online marketing / 
Dave Chaffey, P.R. Smith. 
 - Fifth edition. 
 - London : |  Routledge,  2017. 
 - xxvii;660p. 
<br/><br/><label>ISBN: </label>9781138494237 
<br/><br/><label>Dewey Class. No.: </label>658.872 CHA.D