APA. American Psychiatric Association, 2013. Diagnostic and statistical manual of mental disorders (5th ed.). American Journal of Psychiatry (2013).

Agüera-Ortiz L, Failde I, Mico JA, Cervilla J, López-Ibor JJ. Pain as a symptom of depression: prevalence and clinical correlates in patients attending psychiatric clinics. J Affect Disord. 2011 Apr;130(1-2):106-12. doi: 10.1016/j.jad.2010.10.022. Epub 2010 Nov 4. PMID: 21055826.

Sheng J, Liu S, Wang Y, Cui R, Zhang X. The Link between Depression and Chronic Pain: Neural Mechanisms in the Brain. Neural Plast. 2017;2017:9724371. doi: 10.1155/2017/9724371. Epub 2017 Jun 19. PMID: 28706741; PMCID: PMC5494581.

R.C. Kessler, P. Berglund, O. Demler, R. Jin, D. Koretz, K.R. Merikangas, A.J. Rush, E.E. Walters, P.S. Wang, National Comorbidity Survey Replication
The epidemiology of major depressive disorder: results from the National Comorbidity Survey Replication (NCS-R). JAMA, 289 (2003), pp. 3095-3105

J.F. Karp, J. Scott, P. Houck, C.F. Reynolds III, D.J. Kupfer, E. Frank
Pain predicts longer time to remission during treatment of recurrent depression
J. Clin. Psychiatry, 66 (2005), pp. 591-597

 Melmed, Raphael N. (2001). Mind, Body and Medicine: An Integrative Text. Oxford University Press Inc, USA. pp. 191–192. ISBN 978-0-19-513164-2

Fava GA, Sonino N. Psychosomatic medicine. Int J Clin Pract. 2010 Jul;64(8):1155-61. doi: 10.1111/j.1742-1241.2009.02266.x. PMID: 20642714.