1. JarssMackenzie: “Diseases of the Heart”1925
2. WrHeberden: “Commentaries on the History and Cure of Diseases” (translated byWm.Heberden junior) 1802 (quoted byPaul D.White “Heart Disease” 1931 page603).
3. J.Conybeare: “Text Book of Medicine” 1929 page4091928 page 602.