Simbulan, Roland G. Manwal sa panlipunang pananaliksik/ Roland G. Simbulan. - Quezon City: IBON Books, c2008. - v, 139 pages; 25 cm. ISBN: 978-0483-44-0 Subjects--Topical Terms: Research--Methodology. Dewey Class. No.: DFil 001.4 / Si4m