^al-Suhrawardi, F. Sobieroj, The Encyclopaedia of Islam, Vol. IX, ed. C.E. Bosworth, E. van Donzel, W.P. Heinrichs and G. Lecomte, (Brill, 1987), 778
^John Renard, Historical dictionary of Sufism, Rowman & Littlefield, 2005. pg xxviii. excerpt: "Abu 'n-Najib 'Abd al-Qahir as-Suhrawardi, Persian shaykh and author, and scholar who thought Ahmad al-Ghazali, Najm al-Din Kubra and Abu Hafs 'Umar as-Suhrawardi
^Qamar al-Huda, Shahab al-Din Suhrawardi, ed. Josef W. Meri, Jere L. Bacharach, Medieval Islamic Civilization: L-Z, Vol. 2. ISBN0-415-96690-6. pp 775-776: "Shahab al-Din Abu Hafs 'Umar al-Suhrawardi belonged to a prominent Persian Sufi family and was responsible for officially organizing the Suhrawardi Sufi order"