Widiger, T. ., Huprich, S. ., & Clarkin, J. . (2011). Proposals for DSM-5: introduction to special section of Journal of Personality Disorders. Journal of Personality Disorders, 25(2), 135. https://doi.org/10.1521/pedi.2011.25.2.135

Widiger, T. ., Trull, T. ., Hurt, S. ., Clarkin, J. ., & Frances, A. . (1987). A multidimensional scaling of the DSM-III personality disorders. Archives of General Psychiatry, 44(6), 557-63. https://doi.org/10.1001/archpsyc.1987.01800180077012