Backhoff Escudero, E., and M. J. González-Montesinos Martínez. “Validity Evidence of the teacher’s Questionnaire in the Teaching and Learning International Study (TALIS-2009)”. Bordon. Revista De Pedagogia, vol. 64, no. 2, June 2012, pp. 173-9, https://recyt.fecyt.es/index.php/BORDON/article/view/22004.