Siriwardhna, Bnadusena ව්යාපාර අධ්යයනය - Aouther Publisher Piliyandala 2015 - 252p 1 - 2023-10-26 ISBN: 978-955-1962-11-1 Nat. Bib. No.: 0004892 Nat. Bib. Agency Control No.: SIR Universal Decimal Class. No.: 330