Columbia subject headings:
Caliphs--Biography.
Imams (Shiites)--Biography.
Islamic Empire--History--622-661.
ʻAlī ibn Abī Ṭālib, Caliph, approximately 600-661.
Harvard subject headings:
‘Alī ibn Abī Ṭālib, Caliph, approximately 600-661.
Princeton subject headings:
ʻAlī ibn Abī Ṭālib, Caliph, approximately 600-661.