RUIZ ALBA, Enrique. Second language acquisition and written language; a new perspective for the study of rock art. Boletín APAR, [S. l.], v. 3, n. 10, p. pp. 344–345, 2011. DOI: 10.70748/ba.10.2011.202. Disponível em: https://revistas.coarpe.org.pe/index.php/BoletinApar/article/view/202. Acesso em: 27 oct. 2025.