Siegel, S. <br/><br/>
Non parametric statistics for the behavioural sciences 

 - New York  McGraw-Hill  1956 
 - xvii, 312p 
<br/><br/><label>Subjects--Index Terms: </label>Statistical tests in research 
<br/><br/><label>Dewey Class. No.: </label>519.5  / SIE