Shea, M., Widiger, T., & Klein, M. (1992). Comorbidity of personality disorders and depression: implications for treatment. Journal of Consulting and Clinical Psychology, 60(6), 857-68. https://doi.org/10.1037//0022-006x.60.6.857

Contractor, A., Caldas, S., Fletcher, S., Shea, M., & Armour, C. (2018). Empirically derived lifespan polytraumatization typologies: A systematic review. Journal of Clinical Psychology. https://doi.org/10.1002/jclp.22586 (Original work published 2018)