1. Anderson, A. B. (1948). In The Practice of Endocrinology, ed. R. Greene, p. 319. Eyre and Spottiswoode, London.
2. The transverse diameter of the heart;Bainton, J.H.;Amer. Heart J,1932
3. The size of the healthy heart and its measurement;Bedford, D.E.; Treadgold, H.A.;Lancet,1931
4. The heart lung coefficient in older people;Cowan, N.R.;Brit. Heart J,1959
5. The cardiothoracic ratio: an index of cardiac enlargement;Danzer, C.S.;Amer. J. med. Sci,1919