John Haygart, Of the Imagination as a Cause And as a Cure of Disorders of the Body, Exemplifi ed by Fictitious Tractors and Epidemical Convulsions (London: R. Crutwell, 1800); Stewart Justman, «Imagination’s Trickery: The Discovery of the Placebo Effect,» The Journal of the Historical Society 10, no. 1 (март 2010): 57–73, doi: 10.1111/j.1540-5923.2009.00292.x, доступен с 1 января 2016; Joel Falack and Julia M. Wright, eds., A Handbook of Romanticism Studies (Chichester, West Sussex, UK; Malden, MA: Wiley, 2012), 31–2; Heather R. Beatty, Nervous Disease in Late Eighteenth-Century Britain: The Reality of a Fashionable Disorder (London; Vermont: Pickering and Chatto, 2011).
