1. Ansell, D. J. and Done, J. T. (1988). Veterinary Research and Development: Cost-Benefit Studies on Products for the Control of Animal Disease, CAS Joint Publication No. 3, Centre for Agricultural Strategy, The University of Reading.
2. The Use of ‘Economic’ Quantitative Modelling Techniques in Livestock Health and Disease-Control Decision Making: A Review;Bennett;Preventive Veterinary Medicine,1992
3. Beynon, V. L. and Howe, K. S. (1973). Losses Incurred in Pig, Cattle and Sheep Production, Commitee of Inquiry into the Veterinary Profession, HMSO.