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.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (9ú heag.)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.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.