Pierce, Roger. <br/><br/>
Research methods in politics :  a paractical guide / 
by Roger Piece. 
 - Loss Angeles :  SAGE,  2008. 
 - 339 p. 
<br/><br/><label>ISBN: </label>9781412935500 
<br/><br/><label>Dewey Class. No.: </label>300.72  / PIE.R