Williams Gynecology, Fourth Edition
by
Joseph I. Schaffer; Barbara L. Hoffman; Karen D. Bradshaw; Lisa M. Halvorson; Marlene M. Corton; John O. Schorge
Williams Obstetrics 26e
by
F. Gary Cunningham; Kenneth J. Leveno; Jodi S. Dashe; Barbara L. Hoffman; Catherine Y. Spong; Brian M. Casey
