SIMBARTL, P.; TANKOVÁ, H. Decorating a Christmas tree in primary school. Journal of Education, Technology and Computer Science, [S. l.], v. 22, n. 4, p. 147–151, 2017. DOI: 10.15584/eti.2017.4.19. Disponível em: https://journals.ur.edu.pl/jetacomps/article/view/6006. Acesso em: 21 lis. 2024.