SPEECE, M. Rural marketing constraints in South Kordofan, Sudan. ERDKUNDE, [S. l.], v. 44, n. 3, p. 209–219, 1990. DOI: 10.3112/erdkunde.1990.03.05. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/2213. Acesso em: 11 dec. 2024.