Nathan P. Gibson, Vanessa Birkhahn and Hanna Friedel, (eds.), "Abū Isḥāq Ibrāhīm ibn Hilāl al-Ṣābiʾ — أبو إسحاق إبراهيم بن هلال الصابئ " in Communities of Knowledge: Interreligious Networks of Scholars in Ibn Abi Usaybiʿa’s History of the Physicians last modified June 23, 2021, https://usaybia.net/person/234 Abū Isḥāq Ibrāhīm ibn Hilāl al-Ṣābiʾ أبو إسحاق إبراهيم بن هلال الصابئ Abū Isḥāq Ibrāhīm ibn Hilāl al-Ṣābiʾ (d. 384/994), head of the chancery in Baghdad during the Būyid period https://usaybia.net/person/234 head of the chancery A literary history of medicine: the 'Uyūn al-anbā' fī ṭabaqāt al-aṭibbā' of Ibn Abī Uṣaybi'ah 10.3.7 10.4.9 no. 11 11.13.3.13