1. Osler and McCrae, Modern Medicine;Abbott, M.E.;London,1927
2. Clinical Lectures on Diseases of the Heart and Aorta;Balfour, G.W.,1898
3. Ballance, C. (1924). Proc. roy. Soc. Med., Sect. of Laryngol., 17, 55.
4. Traitedpratique des maladies du caeur et de l'aorte;Banks-Davis, H.J.,1924
5. Beardwood, J. T. (1931). Med. Clin. N. Amer., 19, 989.