Kumarapeli, Thisara ව්යාපාරික මනෝවිද්යාව = viyaapaarika manoovidyaava - Colombo; S. Godage, 2005. - 174p. 21cm ISBN: 955-20-7279-4 Subjects--Topical Terms: Industrial Psychology Dewey Class. No.: 158.7 / KUM