A study on the effectiveness of the widows' Widowers' and Orphans' Pension Payment system 
Senacirathne, D.D.C. 
 -  2006. 
 - ix,66p.: 
<br/><br/> Ratnayake, Y., & Wijekoon, W.M.M.G.D. 
<br/><br/><label>Gov. Doc. Class. No.: </label>MPM/T/25