NADER, A. M.; HUSSAIN ALI, J. M. Confrontation of Efficiency and Its Relationship to Some Variables among Middle School Students. Journal of Tikrit University for Humanities, [S. l.], v. 28, n. 8, p. 362–386, 2021. DOI: 10.25130/jtuh.28.8.2021.17. Disponível em: https://jtuh.org/index.php/jtuh/article/view/1514. Acesso em: 2 aug. 2026.