1. Fox, Herbert: Diseases in Captive Wild Animals and Birds, p. 501.
2. Chronic Infection of the Udder of a Goat with Avian Tubercle Bacilli
3. Cobbett, L.: The Causes of Tuberculosis (Cambridge University Press), p. 527.
4. Hare, Tom: Proceedings Royal Society Medicine, xxv, No. 10.