Beckmann and Ling's Obstetrics and gynecology / American College of Obstetricians and Gynacologists with lead authors Robert Casanova, Alice Chuang, Alice R. Goepfert, Nancy A. Hueppchen, Patrice M. Weiss, original authors Charles R.B. Beckmann, Frank W. Ling, William N.P. Herbert, Douglas W. Laube, Roger P. Smith.    Philadelphia : Wolters Kluwer, [2019]  ©2019 . xvi, 463 stran