1. Anderson, Allan Heaton. 2014. An Introduction to Pentecostalism. 2nd ed. Cambridge: Cambridge University Press.
2. Brown, Colin. 2003. Campbell Interrupted Blair as He Spoke of His Faith: ‘We Don’t Do God’. Telegraph, May 4. https://www.telegraph.co.uk/news/uknews/1429109/Campbell-interrupted-Blair-as-he-spoke-of-his-faith-We-dont-do-God.html. Accessed 31 Jan 2023.
3. Cartledge, Mark J. 2006a. Encountering the Spirit: The Charismatic Tradition. London: Darton, Longman & Todd.
4. Studies in Pentecostal and Charismatic Issues,2006
5. ———. 2008. The Early Pentecostal Theology of Confidence Magazine (1908–1926): A Version of the Five-Fold Gospel? Journal of the European Pentecostal Theological Association 28 (2): 117–130.