1. Advantica for Health and Safety Executive. A review of gas appliance CO emissions legislation. December 2000 [Internet]. [cited 2010 Oct 12]. Available from:http://www.hse.gov.uk/gas/domestic/pdf/coemmissionsreview.pdf
2. Carbon monoxide (MEDITEXT® Medical Management) [Internet]. In: Klasco RK, editor. TOMES® System. Thomson Micromedex, Greenwood Village, Colorado [cited 2007 Feb]. Quoted by the HPA Compendium of Chemical Hazards: Carbon monoxide [cited 2009 Nov 8]. Available from: http://www.hpa.org.uk/webc/HPAwebFile/HPAweb_C/1194947421806.
3. Unintentional carbon monoxide-related deaths in the United States, 1979 through 1988
4. [COGSS] The Carbon Monoxide and Gas Safety Society. 2009a. “[homepage online] [Internet]. [cited 2009 Sept 21]”. Available from:http://www.co-gassafety.co.uk