Giaconi, Valentina, et al. “Teaching Practices, Self-Efficacy and Value With Regard to Problem Solving in Mathematics: Design and Validation of a Questionnaire”. Enseñanza De Las Ciencias: Revista De investigación Y Experiencias didácticas, vol. 36, no. 3, Nov. 2018, pp. 99-120, https://raco.cat/index.php/Ensenanza/article/view/343230.