Pork, Wolter ඉගෙනුම සපල කර ගැනීමේ උපදෙස් අත්පොත = igenuma sapala kara ganime upades athpotha - Mulleriyawa: Wijesuriya Grantha Kendraya, 2001. - xx,252p.; 21 cm. ISBN: 955-652-096-1 Subjects--Topical Terms: School Education Dewey Class. No.: 371.30281 / GAM