890 
    
    Joshua Wolf Shenk, «What Makes Us Happy», The Atlantic, June 2009, по состоянию на 7 января 2017 года, .
                891 
    
    George Vaillant, Triumphs of Experience: The Men of the Harvard Grant Study (Cambridge, MA: Belknap, 2012), 48.
                892 
    
    George Vaillant, Triumphs of Experience: The Men of the Harvard Grant Study (Cambridge, MA: Belknap, 2012), 48.
                893 
    
    George Vaillant, Triumphs of Experience: The Men of the Harvard Grant Study (Cambridge, MA: Belknap, 2012), 48.
                894 
    
    Цит. по Donald W. Goodwin, Samuel B. Guze, and Eli Robins, «Follow-Up Studies in Obsessional Neurosis», Archives of General Psychiatry 20, no 2 (1969): 182.