PEJSAR, Z. E-learning in arithmetic courses delivered in the combined form of study for primary school teachers. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 3, p. 165–170, 2003. Disponível em: https://studmath.uken.krakow.pl/article/view/13484. Acesso em: 30 oct. 2026.