Jayathilaka,K.M.D.S සංයුක්ත ගණිතය ආදර්ශ 2 - Lakva Publishers - 89p 1 - 2023-11-20 ISBN: 978-955-1605-33-3 Nat. Bib. No.: 0004747 Nat. Bib. Agency Control No.: JAY Universal Decimal Class. No.: 510