1. Blackstone W (1765) Commentaries on the laws of England. Clarendon, Oxford
2. Cook RJ (1985) Legal abortion: limits and contributions to human life. Ciba Found Symp 115: 211. (Abortion: Medical progress and social implications)
3. Cook RJ, Dickens BM (1979) Abortion laws in Common-wealth countries. World Health Organization, Geneva
4. Cook RJ, Dickens BM (1986) Issues in reproductive health law in the Commonwealth. Commonwealth Secretariat
5. London Darwin C (1871) The descent of man and selection in relation to sex. Appleton, New York