Perman, Roger,  1949- <br/><br/>
Natural resource and environmantal economics 
Roger Perman, Yue Ma, James McGilvray 
 - London  Longman  1996 
 - 396 p. : ill. ; 25 cm. 
<br/><br/>p. 378-388. 
<br/><br/><label>ISBN: </label>0582257271  RM117.54 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental economics<br/>Natural resources--Management<br/>Sustainable development