Rubin, Bruce K. (23 November 2009). "The Role of Mucus in Cough Research". Lung. 188 (Suppl 1): S69–72. doi:10.1007/s00408-009-9198-7. PMID 19936981.
Charles Richet, MD, Professor of Physiology, University of Paris. Ancient Humorism and Modern Humorism. Delivered at the International Congress of Physiology held in Vienna, September 27th to 30th 1910, as reported on page 921 of the British Medical Journal of October 1, 1910: Richet C (1910). "An Address ON ANCIENT HUMORISM AND MODERN HUMORISM: Delivered at the International Congress of Physiology held in Vienna, September 27th to 30th" (PDF). Br Med J. 2: 921–6. doi:10.1136/bmj.2.2596.921. PMC 2336103. PMID 20765282.
