Sampath ,Udara ගණිතය : 8 ශ්රේණීය - Samudara : Colomb; 2018. - 191 p ; 21 m . 01 - 2025-08-21 ISBN: 9789556808384 Nat. Bib. No.: 0008586 Nat. Bib. Agency Control No.: SAM Universal Decimal Class. No.: 510