1. Ancient Anodynes: Primitive anaesthesia and allied conditions;Ellis,1946
2. The History of Surgical Anesthesia;Keys,1978
3. An account of the first use of sulphuric acid by inhalation as an anesthetic in surgical operations;Long;South. Med. Sur. J.,1849
4. Paracelsus and his contributions to anesthesia;Gravenstein;Anesthesiology,1965
5. 71re Evolution of Anaesthesia;Davison;Baltimore: Williams & WIlkins. p.,1965