Pushpawelage, Smpath ආර්ථික විද්යාව - Samudra Poth Prakashak Colombo 2015 - 189p 1 - 2023-10-26 ISBN: 978-955-680-394-5 Nat. Bib. No.: 0004893 Nat. Bib. Agency Control No.: PUS Universal Decimal Class. No.: 330