د. فاضل خليل إبراهيم أ. The use of Effective Teaching Principles by Preparatory School Teachers. College of Basic Education Research Journal, [S. l.], v. 11, n. 1, p. 1–27, 2012. Disponível em: https://jeh.uomosul.edu.iq/index.php/berj/article/view/38272. Acesso em: 27 oct. 2025.