1. Anon 2006 Scottish Agricultural College, Veterinary Services Monthly report www.sac.ac.uk/consulting/services/s-z/veterinary/publications/monthlyreports/2006/aug/avian
2. Anon 2007 Veterinary Laboratories Agency, Surveillance Report Avian http://vla.defra.gov.uk/reports/docs/rep_survrep_qtlya0207.pdf
3. Anon 2009 Veterinary Investigation Surveillance Report - Veterinary Investigation Diagnosis Analysis database http://vla.defra.gov.uk/reports/rep_vida09.htm
4. Avian vibrionic hepatitis in laying hens;Burch;Veterinary Record,2005
5. Increased mortality on a free-range layer site;Crawshaw;Veterinary Record,2003