Pushpawelage ,Sampath ආර්ථික විද්යාව - Samudra Poth Hala Colombo 2015 - 310p 1 - 2023-10-30 ISBN: 978-955-680-416-4 Nat. Bib. No.: 0004495 Nat. Bib. Agency Control No.: PUS Universal Decimal Class. No.: 330