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://test.zurnalai.vu.lt/psichologija/article/view/8930. Acesso em: 26 oct. 2025.