راضي سعد م. ع. . The effectiveness of the Gibbs model in the achievement of the fourth -grade literary students in the subject of history. مجلة أبحاث الذكاء, [S. l.], v. 16, n. 34, p. 482–504, 2023. Disponível em: https://iru.uomustansiriyah.edu.iq/index.php/intel/article/view/444. Acesso em: 23 apr. 2024.