Application of travel cost method to assess the pricing policy of wildlife national parks: special reference to Udawalawe national park 
Gamlath,G.M.D.H.S. 
 -  September 2013 
 - ix,68p.: 
<br/><br/> Jayasundara,Neranjala J. 
<br/><br/><label>Gov. Doc. Class. No.: </label>MPM/T/245