1. ACRE (2007) Managing the Footprint of Agriculture: Towards a Comparative Assessment of Risks and Benefits for Novel Agricultural Systems. http://webarchive.nationalarchives.gov.uk/20081107165902/http://www.defra.gov.uk/environment/acre/fsewiderissues/pdf/acre-wi-final.pdf
2. Measuring the changing state of nature;Balmford;Trends in Ecology & Evolution,2003
3. The 2010 challenge: data availability, information needs and extraterrestrial insights;Balmford;Philosophical Transactions of the Royal Society B: Biological Sciences,2005
4. Battersby, J. (2005) UK mammals: species status and population trends. First Report by the Tracking Mammals Partnership (eds). JNCC/Tracking Mammals Partnership, Peterborough, UK.