Arrington, G. E. (1978). The relationship between self-concept and achievement in the Inventory of Development Tasks [microform]. Photoduplication Service. University of the Philippines Library.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Arrington, George Edwin. The Relationship Between Self-concept and Achievement in the Inventory of Development Tasks [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1978.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Arrington, George Edwin. The Relationship Between Self-concept and Achievement in the Inventory of Development Tasks [microform]. Photoduplication Service. University of the Philippines Library, 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.