Islam has three primary branches of belief, based largely on a historical disagreement over the succession of authority after Muhammad's death. These are known as Sunni, Shi'ite, and Kharijite.
* The Orthodox Christian-Muslim Symposium. ''Orthodox Christians and Muslims''. Edited by Fr. N.M. Vaporis. Holy Cross Orthodox Press, Brookline, Massachusetts, 1986.
(ISBN 0917651340 )
Orthodoxy and Islam==
* [[A History of Orthodox Missions Among the Muslims]]
* Saints of the Orthodox Church who converted from Islam: St. [[Serapion of Kozheozero]], St. [[Constantine Hagarit]], St. [[Ahmed the Deftedar]], St. [[Abu of Tbilisi]], St. [[Peter and Stephan of Kazan]].
* [[Zakaria Botros]]
* [[Roman Silantyev]]
* [http://www.orthodoxinfo.com/general/stjohn_islam.aspx St. John of Damascus' Critique of Islam]. Orthodox Christian Information Center.
* [http://www.spiegel.de/international/spiegel/0,1518,437587,00.html "Islam is a Different Culture"]. SPIEGEL ONLINE: Interview with [[w:Walter Kasper|Cardinal Walter Kasper]], September 18, 2006.
* Directions to Orthodoxy. [http://directionstoorthodoxy.org/mod/news/view.php?article_id=232 Eritrea Imposes New Controls on Orthodox Church]. 26 Dec, 2006.