Risālatān li-Abī Ḥayyān al-Tawḥīdī : al-risālah al-ulá Fī al-ṣadāqah wa al-ṣadīq, wa-al-risālah al-thānīyah Fī al-ʻulūm. - Abū Ḥayyān al-Tawḥīdī, ʻAlī ibn Muḥammad, active 10th century (Maṭbaʻat al-Jawāʼib], 1884)