The mystical philosophy of Ibn Masarra and his followers/ Miguel Asín Palacios ; gtranslated
[from the Spanish] by Elmer H. Douglas and Howard W. Yoder, 1978
The mystical teachings of Al-Shadhili : a translation from the Arabic of Ibn al-Sabbagh's
"Durrat al-Asrar wa Tuhfat al-Abrar" / by Elmer H. Douglas ; ed. with an introd. and
a bibliogr. by Ibrahim M. Abu-Rabi, 1993