Verheul, R., Andrea, H., Berghout, C. C., Dolan, C. V., Busschbach, J. J. V., Kroft, P. J. A., Batemen, A. W., & Fonagy, P. (2008).
Severity Indices of Personality Problems (SIPP-118): Development, factor structure, reliability, and validity.
Psychological Assessment,
20(1), 23-34.
https://doi.org/10.1037/1040-3590.20.1.23