New trends in mathematies teaching / 
prepared by the International Commission of Mathematical Instruction. 
 - París :  UNESCO,  1977. 
 - 145 p. :  il. 
 - The Teaching of Basic Sciences : Mathematies .
<br/><br/><label>ISBN: </label>9231010166 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>51(07) =20 TEN Vol.III.