Athapathu, R.B ස්වාභාවික ව්යසන - S.Godage Publisher Colombo 2010 - 212p 1 - 2023-11-27 ISBN: 978-955-30-0637-0 Nat. Bib. No.: 0001680 Nat. Bib. Agency Control No.: ATH Universal Decimal Class. No.: 551.5