1. 1. OM Radostits, DC Blood, and CC. Gay, Veterinary medicine. A textbook of the diseases of cattle, sheep, pigs, goats and horses . 8thedn. Balliere Tindall, London, 1994 :841 -849 .
2. 2. European Commission Directorate . Possible links between Crohn's disease and Paratuberculosis . InReport of the scientific committee on animal health and animal welfare. 2000 :1 -76 .
3. Ovine Johne's disease in Australia - the first 20 years
4. 5. Animal Health Australia . The New Market Assurance Program for CattleMAP and SheepMAP 2000, http://www.aahc.com.au/jd/maps/map.pdf. 2000 : p6 . Retrieved 20 December2000 .