Breach of Faith, s. 8. Human Rights Watch, June 2005. ”Estimates of around 20 million would be appropriate” Teoksen verkkoversio Viitattu 29 March 2014.
Asian Religions in British Columbia. University of Columbia Press. ”The community currently numbers around 15 million spread around the world” ISBN 978-0-7748-1662-5Teoksen verkkoversio Viitattu 29 March 2014.
Juan Eduardo Campo: Encyclopedia of Islam, s. 24. Määritä julkaisija! ”The total size of the Ahmadiyya community in 2001 was estimated to be more than 10 million” ISBN 0-8160-5454-1Teoksen verkkoversio Viitattu 29 March 2014.
Robert Brenton Betts: The Sunni-Shi'a Divide: Islam's Internal Divisions and Their Global Consequences. Potomac Books, Inc., 31.7.2013. ISBN 9781612345222Teoksen verkkoversio Viitattu 7.3.2019. (englanniksi)
Pew Research Center: Mapping the Global Muslim Populationpewforum.org. 7.10.2009. ”there are 1.57 billion Muslims of all ages living in the world today [...] Of the total Muslim population, 10–13% are Shia Muslims and 87–90% are Sunni Muslims” Viitattu 7.3.2019. (englanniksi)
