W. S. Wan Abdullah, “Gerd R. Puin, Observations on Early Qur’an Manuscripts in Sana’a’, (5 Hlm.) Dalam Stefan Wild, (Ed.) The Qur’an as Text, (Leiden - New York - Koln: E.J. Brill, 1996)”, JUD, vol. 13, pp. 153–156, Jun. 2001.