Dramkirthi, Nandhana ප්රයෝගික පරීක්ෂණ - Methsara Prakashan Kotte 2012 - 232p 1 - 2023-11-14 ISBN: 978-955-54354-0-6 Nat. Bib. No.: 0006611 Nat. Bib. Agency Control No.: DAR Universal Decimal Class. No.: 570