Vidanapthirana , A.H අධ්යාපන ප්රතිභා 8 : - Author : Colombo ; 2016. - 267 p ; 21cm . 01 - 2024-07-04 ISBN: 9789550460311 Nat. Bib. No.: 0009957 Nat. Bib. Agency Control No.: VID Universal Decimal Class. No.: 780