APA aipamena

HOFFMAN, B. L. (2011). Williams Obstetrics Study Guide. Mc Graw- hill.

Chicago Style aipamena

HOFFMAN, Barbara L. Williams Obstetrics Study Guide. Mc Graw- hill, 2011.

MLA aipamena

HOFFMAN, Barbara L. Williams Obstetrics Study Guide. Mc Graw- hill, 2011.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.