Original: Matthew Steel, (2005), Pentecostalism in Zambia: Power, Authority and the Overcomers, MSc Dissertation - an examination of the growth and effects of Pentecostalism on development, University of Wales Grant Wacker, (2001), Heaven Below: Early Pentecostals and American Culture, Harvard University Press, Cambridge, MA - An academic history of early Pentecostalism.
Simplified: Grant Wacker, (2001), Heaven Below: Early Pentecostals and American Culture, Harvard University Press, Cambridge, MA - An academic history of early Pentecostalism.