Abba, U. M. (2020). Relationship between principal competence, parent involvement, school facilities and teaching approaches for students with disabilities.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Abba, Umar Musa. Relationship Between Principal Competence, Parent Involvement, School Facilities and Teaching Approaches for Students with Disabilities. 2020.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Abba, Umar Musa. Relationship Between Principal Competence, Parent Involvement, School Facilities and Teaching Approaches for Students with Disabilities. 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.