GREY-JOHNSON, Crispin. 3 - The African Informal Sector at the Crossroads: Emerging Policy Options: by Crispin Grey- Johnson. Africa Development, [S. l.], v. 17, n. 1, 1992. DOI: 10.57054/ad.v17i1.2699. Disponível em: https://journals.codesria.org/index.php/ad/article/view/2699. Acesso em: 2 aug. 2025.