1. PRN, The Netherlands Perinatal Registry (Stichting Perinatale Registratie Nederland). Jaarboek Zorg in Nederland, 2003, 2008, 2012. http://www.perinatreg.nl/jaarboeken_zorg_in_nederland .
2. KNOV, Position paper on labour pain (Standpunt pijn); November 2013, pg 15. Ovimex Grafische Bedrijven, Deventer; 2013.
3. de Vries R. A Pleasing Birth: Midwives and Maternity Care in the Netherlands. Amsterdam: Amsterdam University Press; 2005. 10.5117/9789053567418
4. Johnson TR, Callister LC, Freeborn DS, Beckstrand RL, Huender K. Dutch women’s perceptions of childbirth in the Netherlands. MCN Am J Matern Child Nurs. 2007;32(3):170–7. 17479054, 10.1097/01.NMC.0000269567.09809.b5
5. Leap N Dodwell M,Newborn M. Working with pain in labour: an overview of evidence. Evidence based briefing paper. https://www.nct.org.uk/intrapartum-care . NCT publications, New Digest 49. 2010.