Columbia subject headings:
Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274.
Harvard subject headings:
Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274
Princeton subject headings:
Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274.