Columbia subject headings:
Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274.
Harvard subject headings:
Islamic philosophy.
Philosophical literature.
Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274. Selections.
Princeton subject headings:
Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274.