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Kwon, J. S.; Kim, Y. M.; Chang, C. G.; Park, B. J.; Kim, L; Yoon, D. J.; Han, W. S.; Lee, H. J.; Lyoo, I. K. (2000). "Three-year follow-up of women with the sole diagnosis of depressive personality disorder: Subsequent development of dysthymia and major depression". The American Journal of Psychiatry. 157 (12): 1966–72. doi:10.1176/appi.ajp.157.12.1966. PMID11097962.
Nemeroff C.B. (2002). "Comorbidity of mood and anxiety disorders: the rule, not the expception?". American Journal of Psychiatry. 159 (1): 3–4. doi:10.1176/appi.ajp.159.1.3. PMID11772680.