Hoyland, Robert: The content and context of early arabic inscriptions. Jerusalem Studies in Arabic and Islam, 1997, 21. vsk, s. 77–102. Artikkelin verkkoversio.
R.G.Hoyland: Seeing islam as other saw it. A survey and evaluation of Christian, Jewish and Zoroastrian writings on early Islam, s. 500. The Darwin Press, 1997. Teoksen verkkoversio.
archive.org
Christoph Luxenberg: The Syro-Aramaic reading of the Koran: a contribution to the decoding of the language of the Koran, s. 327. (Rev. and enlarged ed) Berliini: H. Schiler, 2007. ISBN 978-3-89930-088-8Teoksen verkkoversio Viitattu 18.1.2018. (englanniksi)