Willerman, Lee, <br/><br/>
The psychology of individual and group differences / 
Lee Willerman. 
 - San Francisco :  W. H. Freeman,  c1979. 
 - x, 531 p. : 
<br/><br/> Includes indexes. 
<br/><br/><label>ISBN: </label>0716702924 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Difference (Psychology)
<br/><br/><label>Dewey Class. No.: </label>155.22  / Ps