HOFFMAN, B. L. (2011). Williams Obstetrics Study Guide. Mc Graw- hill.
Cita Chicago (17th ed.)HOFFMAN, Barbara L. Williams Obstetrics Study Guide. Mc Graw- hill, 2011.
Cita MLA (9th ed.)HOFFMAN, Barbara L. Williams Obstetrics Study Guide. Mc Graw- hill, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.