Potten, Heather <br/><br/>
Clockwise : elementary : classbook / 
Heather Potten, Jonathan Potten 
 - Oxford :  Oxford University Press,  2001 
 - 111 p. :  ill. (some col.) ;  28 cm. 
 - Short course series .
 - Short course series .
<br/><br/><label>ISBN: </label>9780194340960 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Textbooks for foreign speakers<br/>English language--Problems, exercises, etc.<br/>English language--Study and teaching