Trull, T. ., Widiger, T. ., & Guthrie, P. . (1990). Categorical versus dimensional status of borderline personality disorder. Journal of Abnormal Psychology, 99(1), 40-8. https://doi.org/10.1037//0021-843x.99.1.40

Hopwood, C. ., Krueger, R. ., Watson, D. ., Widiger, T. ., Althoff, R. ., Ansell, E. ., … Zimmermann, J. . (2019). Commentary on "The Challenge of Transforming the Diagnostic System of Personality Disorders". Journal of Personality Disorders, 1-4. https://doi.org/10.1521/pedi_2019_33_00 (Original work published 2019)

Hopwood, C. ., Kotov, R. ., Krueger, R. ., Watson, D. ., Widiger, T. ., Althoff, R. ., … Zimmermann, J. . (2018). The time has come for dimensional personality disorder diagnosis. Personality and Mental Health, 12(1), 82-86. https://doi.org/10.1002/pmh.1408

Helle, A. ., Trull, T. ., Widiger, T. ., & Mullins-Sweatt, S. . (2017). Utilizing interview and self-report assessment of the Five-Factor Model to examine convergence with the alternative model for personality disorders. Personality Disorders, 8(3), 247-254. https://doi.org/10.1037/per0000174

Trull, T. ., Widiger, T. ., & Frances, A. . (1988). Mr. Trull and Associates Reply. The American Journal of Psychiatry, 145(2), 277a-278. https://doi.org/10.1176/ajp.145.2.277-a

Trull, T. ., & Widiger, T. . (2013). Dimensional models of personality: the five-factor model and the DSM-5. Dialogues in Clinical Neuroscience, 15(2), 135-46.

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

Trull, T. ., Widiger, T. ., & Frances, A. . (1987). Covariation of criteria sets for avoidant, schizoid, and dependent personality disorders. The American Journal of Psychiatry, 144(6), 767-71. https://doi.org/10.1176/ajp.144.6.767

Widiger, T. ., Frances, A. ., & Trull, T. . (1987). A psychometric analysis of the social-interpersonal and cognitive-perceptual items for the schizotypal personality disorder. Archives of General Psychiatry, 44(8), 741-5. https://doi.org/10.1001/archpsyc.1987.01800200069010

Widiger, T. ., & Trull, T. . (1969). Plate tectonics in the classification of personality disorder: shifting to a dimensional model. The American Psychologist, 62(2), 71-83. https://doi.org/10.1037/0003-066X.62.2.71 (Original work published 1969)