Perera,Dunstan Advanced level combined mathematics (pure mathematics) simplified presentation - 2nd - Gihan Book Publication Dehiwala 2012 - 404p 1 - 2023-11-10 ISBN: 978-955-593-360-5 Nat. Bib. No.: 0009175 Nat. Bib. Agency Control No.: PER Universal Decimal Class. No.: 510