Maldonado, Gloria. <br/><br/>
Mastering English 
Gloria Maldonado, Carmen Mercado. 
 - 4. ed. 
 - Puerto Rico  Editorial Panamericana  2004. 
 - 250 p.  col. ill.  28 cm. 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Study and teaching--Spanish speakers.--Puerto Rico