Angulo-Brunet, A., C. Viladrich, S. Pallarès, M. Borrueco, Y. Ramis, M. Torregrossa, and J. Cruz. “Can Multi-Item Measures and Single-Item Measures Be Trusted to Assess Self-Determination Theory Constructs in the Elderly?”. Psicothema, vol. 32, no. Número 4, Nov. 2020, pp. 583-9, https://reunido.uniovi.es/index.php/PST/article/view/17061.