Rabi'a, the mystic and her fellow-saints in Islam : being the life and teachings of Rabi'a al-'Adawiyya al-Qaysiyya, of Basra, Sufi Saint, ca A.H. 99 - 185, A.D. 717 - 801, together with some account of the place of the women in Islam - Smith, Margaret, 1884-1970 (Philo Press, 1974)