Lamon, Susan J. <br/><br/>
Teaching fractions and ratios for understanding :  essential content knowledge and instructional strategies for teachers / 
Susan J. Lamon 
 - 3rd ed. 
 - New York :  Routledge,  2012 
 - xiii, 266 p. :  ill. ;  26 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>9780415886123 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fractions--Study and teaching (Elementary)<br/>Ratio and proportion--Study and teaching (Elementary)