Puahpawelage ,Sampath ව්යාපාර අධ්යයනය : - Smudra : Colombo ; 2014. - 411p 22 cm 1 - 2023-11-06 ISBN: 978-955-680-300-6 Nat. Bib. No.: 0004604 Nat. Bib. Agency Control No.: PUS Universal Decimal Class. No.: 330