Pushpawelage, Sampath ආර්ථික විද්යාව - Samudra Poth Prakashakyo Colombo 2017 - 256p 1 - 2023-10-30 ISBN: 978-955-680-452-2 Nat. Bib. No.: 0005901 Nat. Bib. Agency Control No.: PUS Universal Decimal Class. No.: 330