Não informado. (1975). British Journal of Obstetrics and Gynaecology. Royal College of Obstetricians and Gynaecologists.
Chicago-Zitierstil (17. Ausg.)Não informado. British Journal of Obstetrics and Gynaecology. London: Royal College of Obstetricians and Gynaecologists, 1975.
MLA-Zitierstil (8. Ausg.)Não informado. British Journal of Obstetrics and Gynaecology. Royal College of Obstetricians and Gynaecologists, 1975.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.