Martínez-Adrián, María. 2020. “THE USE OF PREVIOUSLY KNOWN LANGUAGES BY L2 LEARNERS: A NOT SO CLEAR-CUT PHENOMENON”. ELIA: Estudios de Lingüística Inglesa Aplicada, no. 20 (December):191-208. https://revistas.uned.es/index.php/ELIA/article/view/29203.