1. Bayford, D. (1789). Mem. Med. Soc. Lond., 2, 271.
2. In Garrod, Batten and Thursfield's Diseases of;Cockayne, E.-A.;Children,1947
3. Dolton, E. G. and Jones, H. E. (1952). Lamcet. 1, 537.
4. Congenital Heart Disease;Edwards, J.E.;Proc. Mayo Clin,1948
5. Griswold, H. E. and Young, M. D. (1949). Pediatrics, 4.