Egy 19. századi pedagógus, Gáspár János. Training and Practice : Journal of Educational Sciences, [S. l.], v. 5, n. 3, p. 107–113, 2007. Disponível em: https://journal.uni-mate.hu/index.php/trainingandpractice/article/view/5451. Acesso em: 30 jan. 2026.