Columbia subject headings:
Civilization--Early works to 1800.
World history--Early works to 1800.
Harvard subject headings:
Civilization--Early works to 1800
Ibn Khaldūn, 1332-1406.
World history--Early works to 1800
Princeton subject headings:
Civilization--Early works to 1800.
Ibn Khaldūn, 1332-1406.
World history--Early works to 1800.