Heredia Ancona, Bertha. <br/><br/>
Manual para la elaboración de material didáctico 
Bertha Heredia Ancona. 
 - 2. ed. 
 - México  Editorial Trillas  1990 (1995 printing) 
 - 176 p.  ill.  23 cm. 
<br/><br/>Includes bibliographical references (p. 171) and index. 
<br/><br/><label>ISBN: </label>9682436931 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching--Aids and devices.<br/>Education, Higher<br/>Individualized instruction<br/>Open plan schools