1. Benefits and risks of episiotomy: an interpretive review of the English language literature, 1860–1980;Thacker;Obstet Gynecol Surv,1983
2. Reflexiones acerca de la indicacion rutinaria de la episiotomia;Lede;Sinopsis Obstetrico Ginecologica,1991
3. West Berkshire perineal management trial;Sleep;BMJ,1984
4. The “Know Your Midwife” report;Flint,1987
5. Is routine episiotomy necessary?;Harrison;BMJ,1984