Pushpawelage, Sampath ව්යාපාර අධ්යයනය - Samudra Publisher Colombo 2017 - 173p 1 - 2023-11-24 ISBN: 978-955-680-684-7 Nat. Bib. No.: 0006104 Nat. Bib. Agency Control No.: PUS Universal Decimal Class. No.: 658.007