GARBAČIAUSKIENĖ, M. Stages of abstraction in grammar mastery. Psichologija, [S. l.], v. 9, n. 2, p. 53–56, 1968. DOI: 10.15388/Psichol.1968.9.8930. Disponível em: https://www.journals.vu.lt/psichologija/article/view/8930.. Acesso em: 5 may. 2024.