- Global Religious Trends 2010 to 2020 by Dr Peter Brierley
- Mission Trends - Christianity in its Global Context, 1970–2020, Center for the Study of Global Christianity - Gordon Conwell
- 2015 Global Statistics (International Bulletin of Missionary Research)
- Unreached Peoples of the World - Prayer Guide
- Cambridge Centre for Christianity Worldwide
- The World If There Were Only 100 People