Professional standards for teaching mathematics / 
Glenda Lappan 
 - Reston (Virginia) :  NCTM,  1991. 
 - VIII, 196 str. :  ilustr. ;  28 sm 
<br/><br/><label>ISBN: </label>0-87353-307-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics