Columbia subject headings:
Hadith--Authorities--Rituals.
Islam--Early works to 1800.
Prayer--Islam--Early works to 1800.
Harvard subject headings:
Hadith--Authorities--Early works to 1800.
Islam--Early works to 1800
Prayer--Islam--Early works to 1800.
Princeton subject headings:
Hadith--Authorities--Rituals.
Islam--Early works to 1800.
Prayer--Islam--Early works to 1800.