Yahaya Ibrahim. (1979). The needed supervisory competencies for instructional supervision as perceived by members of the federal inspectorate of schools, Malaysia. Southern Illinois University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Yahaya Ibrahim. The Needed Supervisory Competencies for Instructional Supervision as Perceived by Members of the Federal Inspectorate of Schools, Malaysia. Carbondale, Illinois: Southern Illinois University, 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Yahaya Ibrahim. The Needed Supervisory Competencies for Instructional Supervision as Perceived by Members of the Federal Inspectorate of Schools, Malaysia. Southern Illinois University, 1979.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.