1. Standards for Birth Centres in England: A Standards Document;Ackerman,2009
2. Birth Center Standards,2017
3. How midwives accomplish natural birth: managing risk and balancing expectations;Annandale;Soc. Probl.,1988
4. Perinatal and maternal outcomes by planned place of birth for healthy women with low risk pregnancies: the birthplace in England national prospective cohort study;BMJ,2011
5. National Maternity and Perinatal Audit;Blotkamp,2019