ILUKENA, M. A.; HAIMBODI, F. N.; SIRINJI, R. A. The historical development of number systems in Namibia. Namibia Educational Reform Forum Journal, [S. l.], v. 26, n. 1, p. 4–12, 2019. Disponível em: https://journals.nied.edu.na/index.php/nerfj/article/view/125. Acesso em: 16 sep. 2024.