Perera Lalith සත්ත්ව පාලනය - Wasana Prakashakyo Dhankotuwa 2009 - 96p 1 - 2023-08-28 ISBN: 978-955-655-705-3 Nat. Bib. No.: 0002817 Nat. Bib. Agency Control No.: PER Universal Decimal Class. No.: 636