1. W. L. Albritton, G. L. Wiggins, W. E. Dewitt, J. C. Feeley, E. H. Lennette, A. Balows, W. J. Hausler, J. P. Truant, and American Society for Microbiology , 1980 : In: (eds), Manual of Clinical Microbiology , Chapter11, 3rd edn , pp. 139 142 . Washington, D.C., USA.
2. Ovine listerial encephalitis: analysis, hypothesis and synthesis
3. D. C. Blood, O. M. Radostis, D. C. Blood, and O. M. Radostis , 1989 : Diseases caused by bacteria. I . In: (eds) Veterinary Medicine. A Textbook of the Diseases of Cattle, Sheep, Pigs, Goats, and Horses , 7th edn , pp. 582 587 . Bailliere Tindall, London, UK.