1. Birth under water;Odent;Lancet,1983
2. Immersion in water during labour and birth;Cluett;Cochrane Database Syst. Rev.,2018
3. Perinatal and maternal outcomes by planned place of birth for healthy women with low risk pregnancies: the Birthplace in England national prospective cohort study;Birthplace in England Collaborative Group;BMJ,2011
4. Characteristics, interventions, and outcomes of women who used a birthing pool: a prospective observational study;Burns;Birth,2012
5. National Institute for Health and Care Excellence. Intrapartum care for healthy women and babies. London: National Institute for Health and Care Excellence; 2014. p. 36.