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„Humoral Theory”. Contagion - CURIOSity Digital Collections. Harvard University. . Accesat în .
Bos, Jacques (). „The rise and decline of character: humoral psychology in ancient and early modern medical theory”. History of the Human Sciences. SAGE Publications. 22 (3): 29–50. doi:10.1177/0952695109104422. ISSN0952-6951.