Tyler, Leona Elizabeth <br/><br/>
The psychology of human differences 
Leona E. Tyler. 
 - 2. ed. 
 - New York  Appleton-Century-Crofts, Inc.  1956. 
 - 562 p.  ills. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p.509-545.