Mathematics in primary education :  learning of mathematics by young children / 
prepared by the International Study Group for Mathematics Learning ; comp. by Z. P. Dienes. 
 - Hamburg (Al. Fed.) :  UNESCO, Institute for Education,  1966. 
 - v, 164 p. 
 - International Studies in education .
<br/><br/><label>Encabezamiento--Tema: </label><br/>Matemáticas--Estudio y enseñanza (Elemental)