Husen, Torsten, ed. <br/><br/>
International study of achievement in mathematics; v. 1/ 

 - New York:  John Wiley & Sons,  1967 
 - 304 
<br/><br/><label>Source: </label> 45704-04-2018 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics