KirkupJ.Spencer Wells' forceps. Journal of Medical Biography2005;13:127
2.
BourgeryJM, JacobNH. Traité complete de l'anatomie de l'homme comprenant la médecine opératoire Paris. Paris: Delauney, 1837;6:34
3.
KirkupJ. The Evolution of Surgical Instruments, Novato. Novato, historyofscience.com, 2006:287–8
4.
BelloniL. La Scuola Ostetrica Milanese Milan. Milan, Per Il VIe Congresso della Societa di Obstetricia e Ginecologia del Mediterraneo Latino,1960:28–38
5.
HibbardB. The Obstetrician's Armamentarium. San Anselmo: Norman Publishing, 2000:142, 224, 239