Sumber alam / 
editor Murtedza Mohamed 
 - Kuala Lumpur :  Dewan Bahasa dan Pustaka,  1991 
 - ix, 214 pages :    illustration, ;    22 cm. 
<br/><br/>p. 203-207 
<br/><br/><label>ISBN: </label>9836217703  RM10.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural resources