1. UK Government Climate Change Act 2008www.legislation.gov.uk/ukpga/2008/27/contents
2. Livestock’s Long Shadow: Environmental Issues and Options;Steinfeld,2006
3. http://unfccc.int/national_reports/annex_i_ghg_inventories/national_inventories_submissions/items/5888.php
4. Mitigating climate change: The role of domestic livestock;Gill;Animal,2009
5. 2006 IPCC Guidelines for National Greenhouse Gas Inventories,2006