Sudasinghe,G.D. අ.පො.ස.(සා.පෙළ)විද්යාඅව 10ශ්රේණි - Kathra Publications Mulleriyawa - 152p 1 - 2024-02-06 ISBN: 978-955-53020-5-0 Nat. Bib. No.: 0004342 Nat. Bib. Agency Control No.: SUD Universal Decimal Class. No.: 500