Flynn, James Robert <br/><br/>
Are we getting smarter? :  rising IQ in the twenty-first century / 
James R. Flynn 
 -  Cambridge, :Cambridge University Press,  2012 
 - xiii, 310 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781107028098 (hbk.) 9781107609174 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intelligence tests--History<br/>Intelligence levels--History