Hettiarachchi, Kumaradasa අධ්යාපන සංවර්ධනය = aDHyaapana sanvardhanaya - Colombo: Godage, 1999. - 120p.; 21 cm. ISBN: 955 20 3637 2 Subjects--Topical Terms: Education Dewey Class. No.: 370 / HET