1. Cowan J. Some notes on the Cardiac Club. Br Heart J 1939;1:97–104.
2. MRC special report series;T Lewis,1917
3. East CFT, Bain CWC. Recent advances in cardiology London: Churchill, 1929:299–311.
4. Assmann H. Die Klinische Roentgendiagnostik der Inneren Erkrankungen Berlin: Vogel, 1929:11–213.
5. Parkinson J. The radiology of rheumatic heart disease. Lancet 1949;i:895–922.