Bedford, A., Watson, R., Henry, J. D., Crawford, J. R., & Deary, I. J. (2011). Mokken scaling analyses of the Personal Disturbance Scale (DSSI/sAD) in large clinical and non-clinical samples. PERSONALITY AND INDIVIDUAL DIFFERENCES, 50(1), 38-42. https://doi.org/10.1016/j.paid.2010.08.017