Hapuarachchi, H.D.Sisira Pahatavata teth kalapaya kumburu bim vi vagava sandaha sakyatavaya anuva vargeka - Colombo HARTI 2016 - vii, 59 p. - - Sinhala research report; 64 . ISBN: 9556122107 Dewey Class. No.: 630 / HAP