Yahaya Ibrahim,  1929- <br/><br/>
The needed supervisory compentencies for instructional supervision as perceived by members of the federal inspectorate of schools, Malaysia / 
Yahaya Ibrahim 
 - Carbondale :  Southern Illinois University,  1979 
 - 202 p. ;  30 cm 
<br/><br/>Thesis ( Ph.D) - Southern Illinois University, 1979