OKODOKO, D. .; SAMUEL, J. . Evaluating the Implementation of NTI/NCE Mathematics Programme by Distance Learning System. Journal of Educational and Social Research, London, U.K., v. 1, n. 5, p. 69, 2011. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/11763. Acesso em: 4 jun. 2023.