1. Kesmodel US The Danish National Indicator Project, Deliveries - Documentalist's report 2010 http://www.nip.dk
2. The Danish National Indicator Project The Danish National Indicator Project - for measuring and improving healthcare services. Manual for the development of disease-specific quality indicators, standards and prognostic factors under The Danish National Indicator Project. Version 3.0. The Danish National Indicator Project (ed.) 2010 http://www.nip.dk
3. National Quality Measurement Using Clinical Indicators: The Danish National Indicator Project;Mainz;J Surg Oncol.,2009
4. Danish National Board of Health Sundhedsdata - fødsler og fødselskomplikationer. [Health data - deliveries and birth complications] 2010 http://www.sst.dk/Indberetning%20og%20statistik/Sundhedsdata/Foedsler_fertilitetsbehandling_og_abort/foedsler4.aspx
5. Oxford Centre for Evidence-based Medicine. Levels of evidence 2009 http://www.cebm.net/index.aspx?o=1025