Realidades 1 / 
By P.P.Boyles; M. Met; R.S. Sayers; C. E. Wargin. 
 - Needham, MA :  Pearson,  2004. 
 - XXXI, 512 p. :  ill. ;  28 cm. 
<br/><br/><br/>Text in eng. and span. 
<br/><br/><label>ISBN: </label>0-13-101687-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Organization of instruction