1. Cochrane Airways Identifying and overcoming challenges in asthma care and self-care http://airways.cochrane.org/sites/airways.cochrane.org/files/uploads/Identifying%20and%20overcoming%20challenges%20in%20asthma%20care%20and%20self%20care.pdf
2. Asthma UK Compare your care. How asthma care in the UK matches up to standards http://www.asthma.org.uk/compareyourcare
3. British Thoracic Society/Scottish Intercollegiate Guidelines Network (BTS/SIGN) SIGN 141 British guideline on the management of asthma. A national clinical guideline. October 2014 https://www.brit-thoracic.org.uk/document-library/clinical-information/asthma/btssign-asthma-guideline-2014/
4. Arterial blood gas analysis or oxygen saturation in the assessment of acute asthma?;Carruthers;Thorax,1995
5. International COPD Coalition Clinical use of pulse oximetry, pocket reference 2010 https://www.theipcrg.org/download/attachments/689660/oximetry_pocket_guide.pdf?version=1&modificationDate=1347261955000