DUMONT, J.J.; HAMERS, J.H.M.; RUIJSSENAARS, A.J.J.M. Rekenstoomissen. Pedagogische Studiën, [S. l.], v. 54, n. 4, 1977. Disponível em: https://pedagogischestudien.nl/article/view/16467.. Acesso em: 8 jun. 2025.