References
- Margotta Roberto. An Illustrated History of Medicine, Lewis Paul. Paul Hambryn, Institute of Neurology, London 1968
- Thorwald Jurgen. Science and Secrets of Early Medicine. Thames and Hudson, London 1962, 1962a and b — p. 54; 1962c - p. 26; 1962d - p. 28; 1962e -p. 100.)