Columbia subject headings:
Muslims--Saudi Arabia--Correspondence.
Muḥammad, Prophet, -632.
Prophets--Correspondence.
Harvard subject headings:
Muḥammad, Prophet, -632
Muslims--Saudi Arabia--Correspondence.
Prophets--Correspondence.
Princeton subject headings:
Muḥammad, Prophet, -632.
Muslims--Saudi Arabia--Correspondence.
Prophets--Correspondence.