1. Home or hospital births?;Adamson;Journal of the American Medical Association,1980
2. Anonymous (1989). C-section rates remain high, but post-Cesarean vaginal births are rising. Family Planning Perspectives, 21, 36–37.
3. Anonymous (1989). Hospitals' Cesarean rate reduced by one-third without adverse effects for mothers and babies. Family Planning Perspectives, 21, 93–94.
4. Parturition;Challis,1986
5. Softening and dilation of the cervix;Dobson;Oxford Reviews of Reproductive Biology,1988