Siriwardhana, Bandusena ව්යාපාර අධ්යයනය - Sipsara Pralashana Pilyandhala 2012 - 221p 1 - 2023-11-03 ISBN: 978-955-1962-06-7 Nat. Bib. No.: 0004700 Nat. Bib. Agency Control No.: SIR Universal Decimal Class. No.: 658