Lederman, Norman G. <br/><br/>
You can't do it by arithmetic, you have to do it by algebra! 

 - 1011-1013 
 - 29, No. 9, 1992 
<br/><br/>Marzo 1993 
 = JOURNAL OF RESEARCH IN SCIENCE TEACHING 
<br/><br/><label>Encabezamiento--Término de Indización: </label>EDUCACION CIENTIFICA INVESTIGACION DE CALIDAD INVESTIGACION EDUCATIVA METODOLOGIA DE LA INVESTIGACION