Sumanasekara, Manike විශ්වයේ යොවුන් නියමුවෝ = Wishwaye youn niyamuwo - Nugegoda: M.Sumanasekara pub. 2000, - 160p.; 21cm ISBN: 955-966281-3 Subjects--Topical Terms: Applied Psychology Dewey Class. No.: 158.1 / SUM