1. Mastitis surveillance scheme: July to December 1980;Anon.;Veterinary Record,1981b
2. Building up to central testing;Anon.;Milk Producer,1982
3. British Standards Institution 1968 Methods of Microbiological Examination for Dairy Purposes
4. British Standards Institution 1982 Code of Practice for Equipment and Procedures for Cleaning and Disinfecting of Milking Machine Installations