Yen, Goh Phay. <br/><br/>
Longman Social Studies :   Revision Guide (4 Secondary). 

 - 2nd Ed. 
 - Singapore :   Pearson,  2009. 
 - vi, 148 p. 
<br/><br/><label>ISBN: </label>9789810612092 
<br/><br/><label>Dewey Class. No.: </label>300  / YEN