van der Sterren-Kusters, W. J. C., van der Heijden, P. T., & Egger, J. I. M. (2017). Psychometric properties of the Dutch Anxiety Change Expectancy Scale (ACES-NL). International Journal of Psychology and Psychological Therapy, 17, 189–198. http://www.ijpsy.com/volumen17/num2/466.html