Al-Ibyari, I., Mafātīḥ al-ʻulūm, Beirut, 1984 Bosworth, C.E.,“Abū ʿAbdallāh al-Khwārizmīon the Technical Terms of the Secretary’s Art”, Journal of the Social and Economic History of the Orient, vol. 12, pp 112-164 (reprinted in Medieval Arabic Culture, no. 15, London, 1983. - annotated translation of the 4th chapter of Mafātīḥ al-ʻulūm (English)