Columbia subject headings:
Islam--Doctrines--History.
Ṭūsī, Muḥammad ibn al-Ḥasan, 995-1067?
Harvard subject headings:
Islam--Doctrines--History
Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274
Princeton subject headings:
Ṭūsī, Muḥammad ibn al-Ḥasan, 995-1067?