Ferreira, A., J. Elejalde, and L. Blanco. “Uses Trends and Error Analysis in Causal Connectors in Francophone, German and Anglo-Saxon Learners of Spanish (LE)”. Boletín De Filología, vol. 56, no. 2, Dec. 2021, pp. pp. 323-351, https://revistaterapiaocupacional.uchile.cl/index.php/BDF/article/view/65735.