VIVAS, Dolores M. Order of Acquisition of Spanish Grammatical Morphemses: Comparison to English and Some Cross-linguistic Methodological Problems. Kansas Working Papers in Linguistics, [S. l.], v. 4, p. 77–105, 1979. DOI: 10.17161/KWPL.1808.659. Disponível em: https://journals.ku.edu/kwpl/article/view/17411.. Acesso em: 1 may. 2024.