Columbia subject headings:
Ḥasan ibn ʻAlī, -approximately 669--Drama.
Ḥusayn ibn ʻAlī, -680--Drama.
Harvard subject headings:
Ḥasan ibn ʻAlī, -approximately 669--Drama.
Ḥusayn ibn ʻAlī, -680--Drama.
Princeton subject headings:
Ḥasan ibn ʻAlī, -approximately 669--Drama.
Ḥusayn ibn ʻAlī, -680--Drama.