Williams, Helen M. <br/><br/>
Statistics for politics & international relations using IBM SPSS statistics/ 
Helen M. Williams 
 - London :  Sage Publications,   c2020. 
 - vii,   397 pages 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9781473902718 (pbk) 
<br/><br/><label>Dewey Class. No.: </label>320.0727