Chase F. Robinson: Conclusion: From formative Islam to classical Islam. Teoksessa: The New Cambridge History of Islam. Vol. 1. The Formation of the Islamic World Sixth to Eleventh Centuries (toim. Chase F. Robinson), s. 692-693. Cambridge University Press, 2011. Teoksen verkkoversio. (Arkistoitu – Internet Archive)
Ibn Muslim: Sahih Muslim Book 1, Hadith 4The Hadith of the Prophet Muhammad (صلى الله عليه و سلم) at your fingertips. sunnah.com.
Muslim: Sahih Muslim Book 1 hadith 20The Hadith of the Prophet Muhammad (صلى الله عليه و سلم) at your fingertips. sunnah.com.
thereligionofpeace.com
Ibn Ishaq: The Life of Muhammad. A translation of Ishaq’s sirat rasul Allah with introduction and notes by A. Guillaume. Oxford University Press, 1955. ISBN 0-19-636033-1Teoksen verkkoversio. (englanniksi)
web.archive.org
Chase F. Robinson: Conclusion: From formative Islam to classical Islam. Teoksessa: The New Cambridge History of Islam. Vol. 1. The Formation of the Islamic World Sixth to Eleventh Centuries (toim. Chase F. Robinson), s. 692-693. Cambridge University Press, 2011. Teoksen verkkoversio. (Arkistoitu – Internet Archive)