Juan Eduardo Campo. Encyclopedia of Islam, 24. ISBN 0-8160-5454-1. Viitattu 29 March 2014. “The total size of the Ahmadiyya community in 2001 was estimated to be more than 10 million”
Robert Brenton Betts: The Sunni-Shi'a Divide: Islam's Internal Divisions and Their Global Consequences. Potomac Books, Inc., 2013-07-31. ISBN 9781612345222. Teoksen verkkoversio (viitattu 7.3.2019). en
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)
