vanasinghe,Shaminda පර්යේෂණ ක්රමවේදය - S.Godage saha Sahodarayoo Wallampitiya 2004 - 232p 1 - 2023-10-23 ISBN: 978-955-20-7255-7 Nat. Bib. No.: 0004208 Nat. Bib. Agency Control No.: VAN Universal Decimal Class. No.: 4208