Write on! :  a grammar composition workbook / 
John Ellis ... [et al.]. 
 - Revised Edition 
 - San Juan, PR :  Editorial Plaza Mayor,  c2009. 
 - 237 p.  ill.  27 cm. 
<br/><br/><label>ISBN: </label>9781563283482 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Grammar<br/>English language--Composition and exercise--Study and teaching--Puerto Rico.<br/>Writing<br/>English language--Study and teaching.