SALAH OMER AL-HEAYLI, B.; KHALED KHEAR ALDEN AL-HAMDANI ABSTRACT, D. Concentration of Attention and their Relationship with personal types (A, B) for preparatory school students. College of Basic Education Research Journal, [S. l.], v. 14, n. 2, p. 99–138, 2018. DOI: 10.33899/berj.2018.146284. Disponível em: https://jeh.uomosul.edu.iq/index.php/berj/article/view/38840. Acesso em: 27 oct. 2025.