HOFFMAN, B. L. (2011). Williams Obstetrics Study Guide. Mc Graw- hill.
Lua i Stíl Chicago (17ú heag.)HOFFMAN, Barbara L. Williams Obstetrics Study Guide. Mc Graw- hill, 2011.
Lua MLA (9ú heag.)HOFFMAN, Barbara L. Williams Obstetrics Study Guide. Mc Graw- hill, 2011.
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