Paul Cobb; Erna Yackel; Kay McClain <br/><br/>
Symbolizing and Communicating in Mathematics Classrooms  Perspectives on Discourse, Tools, and Instructional Design 

 -  Taylor and Francis  2000 
<br/><br/><label>ISBN: </label>9781410605351 
<br/><br/><label>Source: </label>EBOOK