M.D. YOUSSEF MUHAMMAD ALI AHMED HAMMOUD. Approval Theory. AL-Yarmouk Journal, [S. l.], v. 19, n. 6-1, p. 1581–1612, 2026. Disponível em: https://journal.al-yarmok.edu.iq/index.php/alyj/article/view/1449. Acesso em: 27 jul. 2026.