GÓROWSKI, J.; ŁOMNICKI, A. O średnich. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia, [S. l.], v. 3, p. 56–66, 2017. Disponível em: https://didacticammath.uken.krakow.pl/article/view/3764. Acesso em: 21 may. 2024.