Hadith 10:737
Abu Bakr narrated to us, he said: Abda narrated to us, from Ubayd Allah ibn Umar, from Nafi, from Ibn Umar: He said: The waiting period (iddah) of the woman who has obtained khul' (divorce initiated by the wife) is one menstrual cycle.
حدثنا أبو بكر قال نا عبدة عن عبيد الله بن عمر عن نافع عن بن عمر قال عدة المختلعة حيضة