1. Energy and Protein Requirements of Ruminants;Agriculture and Food Research Council,1993
2. The Nutrient Requirements of Ruminant Livestock;Agriculture Research Council,1980
3. Chlamydial abortion;Aitken,2000
4. Pregnancy toxaemia in the ewe;Andrews;In Pract.,1997
5. Review – Q Fever;Angelakis;Vet. Microbiol.,2010