Siriwardhana, Bnadusena ව්යාපාර අධ්යයනය - Aouther Prakashanyaki Piliyandala 2019 - 326p 1 - 2023-11-01 ISBN: 978-624-95029-1-8 Nat. Bib. No.: 0007984 Nat. Bib. Agency Control No.: SIR Universal Decimal Class. No.: 657