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Monteleone, P.; Martiadis, V.; Maj, M. (2011). "Circadian rhythms and treatment implications in depression". Progress in Neuro-Psychopharmacology & Biological Psychiatry. 35 (7): 1569–74. doi:10.1016/j.pnpbp.2010.07.028. PMID20691746. S2CID24239162.
Malkoff-Schwartz, S.; Frank, E.; Anderson, B. P.; Hlastala, S. A.; Luther, J. F.; Sherrill, J. T.; Houck, P. R.; Kupfer, D. J. (2000). "Social rhythm disruption and stressful life events in the onset of bipolar and unipolar episodes". Psychological Medicine. 30 (5): 1005–16. doi:10.1017/s0033291799002706. PMID12027038.
Murray, G.; Nicholas, C. L.; Kleiman, J.; Dwyer, R.; Carrington, M. J.; Allen, N. B.; Trinder, J. (2009). "Nature's clocks and human mood: The circadian system modulates reward motivation". Emotion. 9 (5): 705–16. doi:10.1037/a0017080. PMID19803592.