Prieto Arratibel, A. and Bueno-Alastuey, M.C. (2015) “influence of socio-economic background, personal effort and motivation on English proficiency”, Huarte de San Juan. Filología y Didáctica de la Lengua, (15), pp. 43–65. Available at: https://revista-hsj-filologia.unavarra.es/hsj-Filologia/article/view/3097 (Accessed: 3 August 2026).