1. Global vaccine action plan 2011–2020,2013
2. The guide to tailoring immunization programmes, increasing coverage of infant and child vaccinatio in the WHO region,2013
3. Centre for Public Health. Health Protection- Childhood Immunisation. http://www.cph.org.uk/showPublications.aspx?pubid=263; 2012 [cited 2012 9 November].
4. The operating framework 2009-10 for the NHS in England;Department of Health,2008
5. The Health and Social Care Information Centre, NHS immunisation statistics England 2011–12.