Columbia subject headings:
Abbasids--Early works to 1800.
Arabic poetry--750-1258.
Islamic Empire--History--750-1258.
Muttaqī lillāh, Caliph, -968.
Rāḍī, Caliph, 909-940.
Harvard subject headings:
Abbasids.
Muttaqī lillāh, Ibrāhīm ibn al-Muqtadir billāh Jaʻfar, Caliph, 909 or 910-967 or 968.
Rāḍī billāh, Muḥammad ibn al-Muqtadir billāh Jaʻfar, Caliph, 909 or 910-940.
Princeton subject headings: