Columbia subject headings:
Abū Bakr, Caliph, -634.
Hadith--Criticism, interpretation, etc.
Muḥammad, Prophet, -632--Friends and associates.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.
Harvard subject headings:
Abū Bakr, Caliph, -634.
Hadith--Criticism, interpretation, etc.
Muḥammad, Prophet, -632--Friends and associates.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.
Princeton subject headings:
Abū Bakr, Caliph, -634.
Hadith--Criticism, interpretation, etc.
Muḥammad, Prophet, -632--Friends and associates.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644.