Research methods / Consuelo G. Sevilla ... [et al.]. - Rev. ed. - Manila : Rex Book Store, c1992. - xiv, 333 p. : ill. ; 22 cm. Bibliography : p. 321 - 329. ISBN: 9712310582 Subjects--Topical Terms: Social sciences--ResearchResearch LC Class. No.: H62 / R31 1992