R., N., E., O,, S., J. (2013). Obstetrics and gynecology at a glance, Fourth Edition (Ed.ke-4). : John Wiley n Sons.

Norwitz, Errol, R.., Schorge, John, O,. "Obstetrics and gynecology at a glance, Fourth Edition". Ed.ke-4 : John Wiley n Sons, 2013. Textbook.