Billstein, Rick. <br/><br/>
A problem solving approach to mathematics for elementary school teachers / 
Rick Billstein, Shlomo Libeskind, Johnny W. Lott. 
 - 10th ed. 
 - Boston :  Addison-Wesley,  c2010. 
 - xiii, 1099, I-14 p. :  ill. (some col.) ;  26 cm. +  1 CD-ROM (4 3/4 in.)