SYSTEM, Abdalla S. AD, Volume 2, n° 2, 1977 - Full Issue. Africa Development, [S. l.], v. 2, n. 2, 1977. DOI: 10.57054/ad.v2i2.2030. Disponível em: https://journals.codesria.org/index.php/ad/article/view/2030. Acesso em: 13 jun. 2025.