كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 162
Muslim reported the same above Hadith in another version narrated by 'Aishah (RA), who narrated 'Sajdah (prostration)' instead of 'Rak'a (prayer unit)' and then he (Muslim) said:
"A Sajdah implies a Rak'a."
وَلِمُسْلِمٍ عَنْ عَائِشَةَ نَحْوَهُ, وَقَالَ: "سَجْدَةً" بَدَلَ "رَكْعَةً".‏ ثُمَّ قَالَ: وَالسَّجْدَةُ إِنَّمَا هِيَ اَلرَّكْعَةُ 1‏ .‏
Reference : Bulugh al-Maram 162
In-book reference : Book 2, Hadith 162
English translation : Book 2, Hadith 162
Hadith Text
Reference