1. Commons Science and Technology Committee in their report on Air Travel and Health (V Report Session 1999–2000 HL Paper 121). ISBN 0 10 444200 X.
2. http://news.bbc.co.uk/1/hi/wales/1922963.stm.
3. House of Commons Health Select Committee Report on the Prevention of Venous thromboembolism in hospitalizes patients- Second report of session 2004–5. http://www.publications.parliament.uk/pa/cm200405/cmselect/cmhealth/cmhealth.htm.
4. Government response to the House of Commons Report on the prevention of venous thromboembolism in hospitalised patients. http://www.dh.gov.uk/en/Publicationsandstatistics/Publications/PublicationsPolicyAndGuidance/DH_4116284.
5. Chief Medical Officer: Sir Liam Donaldson’s letter announcing the recommendations of the expert working group on the prevention of venous thromboembolism in hospitalized patients. http://www.dh.gov.uk/en/Publicationsandstatistics/Lettersandcirculars/Dearcolleagueletters/DH_073957.