1. An Introduction to the Practice of Midwifery;Denman,1788
2. The Princess Charlotte of Wales: a triple obstetric tragedy;Holland;J Obstet Gynaecol Br Emp,1951
3. Aphorisms on the Application and Use of the Forceps;Denman,1817
4. The prophylactic forceps operation;DeLee;Am J Obstet Gynecol,1920
5. Births in the United States, 2013;Martin;NCHS Data Brief,2014