كتاب الصلاة
4
The Book of Prayers
(4)
Chapter: It Is Recommended To Have Two Mu'adhdhin In A Single Masjid
(4)
باب اسْتِحْبَابِ اتِّخَاذِ مُؤَذِّنَيْنِ لِلْمَسْجِدِ الْوَاحِدِ ‏‏
Sahih Muslim 380 b

This hadith has been narrated on the authority of 'A'isha by another chain of transmitters.

وَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا عُبَيْدُ اللَّهِ، حَدَّثَنَا الْقَاسِمُ، عَنْ عَائِشَةَ، مِثْلَهُ ‏.‏
Reference : Sahih Muslim 380 b
In-book reference : Book 4, Hadith 8
USC-MSA web (English) reference : Book 4, Hadith 742
  (deprecated numbering scheme)