Perera, Nihal Ranjith ආර්ථික විද්යාව - Vidhudeya Publisher Nugegoda 2018 - 201p 1 - 2024-02-02 ISBN: 978-955-4530-62-1 Nat. Bib. No.: 0007030 Nat. Bib. Agency Control No.: PER Universal Decimal Class. No.: 657.834