PAKPAHAN, F. H.; SARAGIH, M. . Theory Of Cognitive Development By Jean Piaget. Journal of Applied Linguistics , [S. l.], v. 2, n. 1, p. 55–60, 2022. DOI: 10.52622/joal.v2i2.79. Disponível em: https://www.journal.eltaorganization.org/index.php/joal/article/view/79. Acesso em: 10 jul. 2026.