[1], Vatican II: Catholic Doctrines on Jews and Muslims, p. 186, Gavin D'Costa ...focused on the Sunni mystic al-Hallaj...Oxford University Press
[2] Biographical Encyclopaedia of Sufis: Central Asia and Middle East, N. Hanif, p. 188 Al Hallaj, in fact, remained always a Sunni, with a strong leaning towards hard asceticism in observing the Ramadan fasts..., Sarup & Sons
