Siriwardhana, Bandhusena ආර්ථික විද්යාව - Aouther Publisher Piliyadala 2020 - 245p 1 - 2023-10-30 ISBN: 978-955-42507-8-9 Nat. Bib. No.: 0007982 Nat. Bib. Agency Control No.: SIR Universal Decimal Class. No.: 330