Spielberger, C., Buela-Casal, G., Agudelo, D., Carretero-Dios, H., & Santolaya, F. (2005). Analysis of convergent and discriminant validity of the Spanish experimental version of the State-Trait Depression Questionnaire (ST-DEP). Actas Españolas De Psiquiatría, 33(6), 374–382. Retrieved from https://actaspsiquiatria.es/index.php/actas/article/view/1115