Ruipérez Rodríguez, Mª Ángeles, Rosa Mª Baños Rivera, Amparo Belloch Fuster, and Myriam Gallardo Pérez. “Attentional biases and vulnerability to depression”. The Spanish Journal of Psychology, vol. 2, vol. 2, 1999, p. 11, https://revistas.ucm.es/index.php/SJOP/article/view/SJOP9999110011A.