Columbia subject headings:
Ṣābī, Hilāl ibn al-Muḥassin, 970-1056--Correspondence.
Harvard subject headings:
Ṣābī, Ibrāhīm ibn Hilāl, 925-994--Correspondence.
Princeton subject headings:
Ṣābī, Ibrāhīm ibn Hilāl, 925-994--Correspondence.