HELLEN, J. A. Some aspects of land use and over population in the Ngoni Reserves of Northern Rhodesia. ERDKUNDE, [S. l.], v. 16, n. 3, p. 190–205, 1962. DOI: 10.3112/erdkunde.1962.03.03. Disponível em: https://www.erdkunde.uni-bonn.de/article/view/1388. Acesso em: 30 apr. 2025.