MOHAMAD MAHMOOD, P. knowledge gap and income gap comparative study between. TANMIYAT AL-RAFIDAIN, [S. l.], v. 35, n. 112, p. 307–323, 2013. DOI: 10.33899/tanra.2013.162107. Disponível em: https://tanmiyat.uomosul.edu.iq/index.php/tanmiyat/article/view/29861. Acesso em: 8 sep. 2025.