Sim, Janet, <br/><br/>
Challenging science / 
Janet Sim. 
 - Singapore :  Educational Publishing House Pte. Ltd.,  2012. 
 - 348 pages :  illustrations, tables, pictures ;  29 cm. 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>9789814356817 
<br/><br/><label>Index Terms--Curriculum Objective: </label><br/>systems-cycles-interactions
<br/><br/><label>Dewey Class. No.: </label>500  / S4