Vernon, Philip Ewart. <br/><br/>
Intelligence, heredity and environment / 
Philip E. Vernon. 
 - San Francisco :  W. H. Freeman,  c1979. 
 - viii, 390 p. ;  25 cm. 
<br/><br/><label>ISBN: </label>0716707373 
<br/><br/><label>Dewey Class. No.: </label>153.9