Thilakarathnna, Bandara ආර්ථික විද්යාව 1 බහුවරණ - Sarasvi Prakashana Nugegoda 2017 - 155p 1 - 2023-10-30 ISBN: 978-955-31-1515-7 Nat. Bib. No.: 0007985 Nat. Bib. Agency Control No.: THI Universal Decimal Class. No.: 330