Prior & Wilson 2005, p. 195; Philpott 2009, p. 237; Sheffield 2003, p. 76; Edmonds 1993, pp. 483–484. Prior, R.; Wilson, T. (2005). The Somme (1st ed.). London: Yale. ISBN978-0-300-10694-7. Retrieved 6 October 2019 – via Archive Foundation. Philpott, W. (2009). Bloody Victory: The Sacrifice on the Somme and the Making of the Twentieth Century (1st ed.). London: Little, Brown. ISBN978-1-4087-0108-9. Sheffield, G. (2003). The Somme. London: Cassell. ISBN978-0-304-36649-1 – via Archive Foundation. Edmonds, J. E. (1993) [1932]. Military Operations France and Belgium, 1916: Sir Douglas Haig's Command to the 1st July: Battle of the Somme. History of the Great War Based on Official Documents by Direction of the Historical Section of the Committee of Imperial Defence. Vol. I (facs. repr. hbk. Imperial War Museum Department of Printed Books and Battery Press ed.). London: Macmillan. ISBN978-0-89839-185-5.