1. Enquête nationale périnatale 2003. www.sante.gouv.fr/htm/dossiers/perinat03/enquete.pdf.
2. European perinatal health report. Data from 2004. www.europeristat.com/bm.doc/european-perinatal-health-report.pdf.
3. Final data for 2006;Natl Vital Stat Rep,2009
4. Breech presentation at term: elective caesarean section is the wrong choice as a standard treatment because of too high risks for the mother and her future children;Verhoeven;Ned Tijdschr Geneeskd,2005
5. Breech presentation: infant versus mother;Visser;Ned Tijdschr Geneeskd,2005