FERNANDES, A. J.; IJUMBA, L. M. N. Know Your Telephone System. Tanzania Journal of Engineering and Technology, [S. l.], v. 2, n. 1, p. 39-46, 1975. DOI: 10.52339/tjet.v2i1.25. Disponível em: https://tjet.udsm.ac.tz/index.php/tjet/article/view/25. Acesso em: 19 apr. 2025.