Jayathilaka,K.M.D.S සංයුක්ත ගණිතය ආදර්ශ 3 - Lakva Publishers - 90p 1 - 2023-11-20 ISBN: 978-955-1605-34-6 Nat. Bib. No.: 0004761 Nat. Bib. Agency Control No.: JAY Universal Decimal Class. No.: 510