Columbia subject headings:
Harvard subject headings:
Hādī ilá al-Ḥaqq, Yaḥyá ibn al-Ḥusayn, 859-910.
Islam--Doctrines--Early works to 1800.
Islamic law--Early works to 1800.
Qāsim ibn Ibrāhīm, -860 or 861
Princeton subject headings:
Hādī ilá al-Ḥaqq, Yaḥyá ibn al-Ḥusayn, 859-910.
Islamic law.
Qāsim ibn Ibrāhīm, -860 or 861.