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B. Pitt and P. J. Deldin. Depression and Cardiovascular Disease: Have a Happy Day – Just Smile! European Heart Journal (2010). 2 августа 2010 года было доступно по адресу doi:10.1093/eurheartj/ehq031.
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Также см. P. Boyle, A. Buchman, L. Barnes, and D. Bennett. Effect of a Purpose in Life on Risk of Incident Alzheimer Disease and Mild Cognitive Impairment in Community-Dwelling Older Persons. Archives of General Psychiatry 67 (2010): 304–10.
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