"宗教年鑑" [Yearly Report on Religion] (PDF) (in Japanese). Agency for Cultural Affairs. 2019. Archived(PDF) from the original on 25 December 2020. Retrieved 2 December 2020.
Salem, Mohamed Omar; Foskett, John (January 2018) [Published in print in 2009]. "Religion and religious experiences". In Cook, Chris; Powell, Andrew; Sims, Andrew (eds.). Spirituality and psychiatry. Cambridge: Royal College of Psychiatrists. p. 236. ISBN9781108609074. Retrieved 3 October 2023.
The results have been studied and found "highly correlated with other sources of data", but "consistently gave a higher estimate for percent Christian in comparison to other cross-national data sets." Hsu, Becky; Reynolds, Amy; Hackett, Conrad; Gibbon, James (9 July 2008). "Estimating the Religious Composition of All Nations". Journal for the Scientific Study of Religion. 47 (4): 678. doi:10.1111/j.1468-5906.2008.00435.x.
Blagov, Sergei (31 July 1999). Religion vs Restrictions and Persecution (Speech). International Association for Religious Freedom World Congress. Vancouver. Archived from the original on 9 October 2011. Retrieved 3 October 2023.
Statistician, Howard Steven Friedman; Teacher, health economist for the United Nations; University, Columbia (25 April 2011). "5 Religions with the Most Followers". The Huffington Post. Archived from the original on 8 December 2016. Retrieved 8 November 2016.
"The Global Religious Landscape". The Pew Forum on Religion & Public Life. Pew Research center. 18 December 2012. Archived from the original on 25 December 2018. Retrieved 18 March 2013.
"Folk Religionists". Pew Research Center's Religion & Public Life Project. 18 December 2012. Retrieved 2 June 2023.
Lugo, Luis; Cooperman, Alan (18 December 2012). Other Religions (Report). Pew Research Center's Religion & Public Life Project. p. 9. Retrieved 3 October 2023.
religiousintelligence.co.uk
Self-reported figures from North Korea (South Korean followers are minimal according to census): "Religious Intelligence UK report". Religious Intelligence. Archived from the original on 13 October 2007. Retrieved 4 July 2009.
worldvaluessurvey.org (28 June 2005). "World Values Survey". worldvaluessurvey.org. Archived from the original on 14 April 2014. Retrieved 12 October 2006.
"The Global Religious Landscape". The Pew Forum on Religion & Public Life. Pew Research center. 18 December 2012. Archived from the original on 25 December 2018. Retrieved 18 March 2013.
Self-reported figures from North Korea (South Korean followers are minimal according to census): "Religious Intelligence UK report". Religious Intelligence. Archived from the original on 13 October 2007. Retrieved 4 July 2009.
Blagov, Sergei (31 July 1999). Religion vs Restrictions and Persecution (Speech). International Association for Religious Freedom World Congress. Vancouver. Archived from the original on 9 October 2011. Retrieved 3 October 2023.
"宗教年鑑" [Yearly Report on Religion] (PDF) (in Japanese). Agency for Cultural Affairs. 2019. Archived(PDF) from the original on 25 December 2020. Retrieved 2 December 2020.
Statistician, Howard Steven Friedman; Teacher, health economist for the United Nations; University, Columbia (25 April 2011). "5 Religions with the Most Followers". The Huffington Post. Archived from the original on 8 December 2016. Retrieved 8 November 2016.
worldvaluessurvey.org (28 June 2005). "World Values Survey". worldvaluessurvey.org. Archived from the original on 14 April 2014. Retrieved 12 October 2006.