Sudusinghe,G.D. අ.පො.ස.(සා.පෙළ)විද්යාඅව 10 ශ්රේණිය - Kathra Publications Mulleriya - 152p 1 - 2024-02-06 ISBN: 978-955-5302-50 Nat. Bib. No.: 0004342 Nat. Bib. Agency Control No.: SUD Universal Decimal Class. No.: 500