Evan Davies, Revivals in Wales (London: John Snow, 1859); Eifion Evans, The Welsh Revival of 1904 (1969) (Bridgend: Evangelical Movement of Wales, 1981); John Harvey, The Art of Piety: The Visual Culture of Welsh Nonconformity (Cardiff: University of Wales Press, 1995), Image of the Invisible: The Visualization of Religion in the Welsh Nonconformist Tradition (Cardiff: University of Wales Press, 1999); W. T. Stead, The Revival of 1905, 4th ed. (London: Review of Reviews Office, 1905).