John J. Moscrop, Measuring Jerusalem: The Palestine Exploration Fund and British Interests in the Holy Land (London and New York: Leicester University, 2000), pp. 76–77. For a biography of Charles Warren, see Watkin W. Williams, The Life of General Sir Charles Warren G.C.M.G., K.C.B., F.R.S. Colonel Commandant, Royal Engineers, (Oxford: Blackwell, 1941).