Spielberger, Charles D., Fernando Gonzalez-Reigosa, Angel Martinez-Urrutia, Luiz F.S. Natalicio, and Diana S. Natalicio. “The State-Trait Anxiety Inventory”. Revista Interamericana de Psicología/Interamerican Journal of Psychology 5, no. 3 & 4 (July 17, 2017). Accessed April 5, 2026. http://sip2013.sipsych.org/ojs-/index.php/IJP/article/view/620.