Inequality in America :  what role for human capital policies / 
edited by James J. Heckman, Alan B. Krueger 
 - Cambridge :  The MIT Press,  2003       
 - xiv, 370 p. 
<br/><br/><label>ISBN: </label>0262083280 
<br/><br/><label>LC Class. No.: </label>HC 110 A475i 2003