Columbia subject headings:
Ibn al-Ṣiddīq, Aḥmad, 1902-1960.
Sufism--Doctrines.
Harvard subject headings:
Ibn al-Ṣiddīq, Aḥmad, 1902-1960
Sufism--Doctrines
Princeton subject headings:
Ibn al-Ṣiddīq, Aḥmad, 1902-1960.
Sufism--Doctrines.