Columbia subject headings:
ʻAlī ibn Abī Ṭālib, Caliph, approximately 600-661.
Harvard subject headings:
ʻAlī ibn Abī Ṭālib, Caliph, approximately 600-661
ʻAlī ibn Abī Ṭālib, Caliph, approximately 600-661--Hadith--Criticism, interpretation, etc.
Princeton subject headings: