Department of Educational උසස් පෙළ ගිණුම්කරණය - Department of Educational Publisher Battramulla 2011 - 245p 1 - 2023-11-10 ISBN: 978-955-0693-00-9 Nat. Bib. No.: 0007992 Nat. Bib. Agency Control No.: EDU Universal Decimal Class. No.: 657