Columbia subject headings:
Abū Bakr, Caliph, -634.
Hadith--Authorities.
Hadith--Texts--Early works to 1800.
Harvard subject headings:
Abū Bakr, Caliph, -634
Hadith--Authorities
Hadith--Texts--Early works to 1800
Princeton subject headings:
Abū Bakr, Caliph, -634.
Hadith--Authorities.
Hadith--Texts--Early works to 1800.