G. E. . Matt and C. . Vázquez, “Anxiety, depressed mood, self-esteem, and traumatic stress symptoms among distant witnesses of the 9/11 terrorist attacks: transitory responses and psychological resilience”, Span. j. psychol., vol. 11, no. 2, pp. 503–515, Jan. 2008, Accessed: Apr. 24, 2024. Available: https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0808220503A