URTON, K.; GRÜNKE, M.; BOON, R. T. . Using a Touch Point Instructional Package to Teach Subtraction Skills to German Elementary Students At-Risk for LD. International Electronic Journal of Elementary Education, [S. l.], v. 14, n. 3, p. 405–416, 2022. Disponível em: https://iejee.com/index.php/IEJEE/article/view/1773. Acesso em: 8 sep. 2024.