Siegel, Sidney. <br/><br/>
Nonparametric statistics for the behavioral science / 
by Sydney Siegel. 
 - London :  McGraw-Hill book Co.,  c1956. 
 - 312 p. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>LC Class. No.: </label>QA278.7  / .S5