Comas, Margarita. <br/><br/>
Metodología de la aritmética y la geometría. 

 - 4th. ed. 
 - Buenos Aires  Editorial Losada  [1957] 
 - 107 p.  illus.  20 cm. 
<br/><br/>Includes bibliography. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic--Study and teaching.<br/>Geometry--Study and teaching.