Definition: Islam Adherents
- “The Global Religious Landscape.” Pew Research Center on Religion & Public Life. 18 December 2012.
- Lipka, Michael. “Muslims and Islam: Key findings in the U.S. and around the world.” Pew Research Center. 17 February 2017.
- “The World’s Muslims: Unity and Diversity.” Pew Research Center. 9 August 2012. "The world’s 1.6 billion Muslims are united in their belief in God and the Prophet Muhammad and are bound together by such religious practices as fasting during the holy month of Ramadan and almsgiving to assist people in need. But they have widely differing views about many other aspects of their faith."