Columbia subject headings:
Islam--History.
Islamic Empire--History--622-661.
Islamic Empire--History--661-750.
Muḥammad, Prophet, -632--Biography.
Harvard subject headings:
Islam--History
Islamic Empire--History--622-661.
Islamic Empire--History--661-750.
Muḥammad, Prophet, -632--Biography.
Princeton subject headings:
Islam--History.
Islamic Empire--History--622-661.
Islamic Empire--History--661-750.
Muḥammad, Prophet, -632--Biography.