Yeo, Dr.Joseph     Seng <br/><br/>
New syllabus mathematics workbook 1 (7th edition) 

 - Oxford  Oxford University Press  1992 
 - 219 
<br/><br/><label>ISBN: </label>9780199407446 
<br/><br/><label>Dewey Class. No.: </label>510  / YEO