Yahaya Ibrahim, 1929- The needed supervisory competencies for instructional supervision as perceived by members of the federal inspectorate of schools, Malaysia / by Yahaya bin Ibrahim. - Carbondale, Illinois : Southern Illinois University, 1979. - 202 p. : ill. ; 30 cm. Thesis (Ph.D.) - Southern Illinois University, 1979. Bibliography : p. 161-168. ISBN: Y910040275 Subjects--Topical Terms: School supervision--Malaysia