Gaban, C. S. (1982). The necessary job competencies of secondary school principals as perceived by school administrators in Sabah, Malaysia. University of Microfilms International.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gaban, Charles S. The Necessary Job Competencies of Secondary School Principals as Perceived by School Administrators in Sabah, Malaysia. Ann Arbor, Michigan: University of Microfilms International, 1982.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gaban, Charles S. The Necessary Job Competencies of Secondary School Principals as Perceived by School Administrators in Sabah, Malaysia. University of Microfilms International, 1982.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.