Perry 2014, p. 225; Williams-Ellis & Williams-Ellis 1919, p. 148. Perry, R. A. (2014). To Play a Giant's Part: The Role of the British Army at Passchendaele. Uckfield: Naval & Military Press. ISBN978-1-78331-146-0. Williams-Ellis, A.; Williams-Ellis, C. (1919). The Tank Corps (online scan ed.). New York: G. H. Doran. OCLC317257337. Retrieved 29 March 2014 – via Archive Foundation.
Williams-Ellis & Williams-Ellis 1919, p. 149; Perry 2014, p. 225. Williams-Ellis, A.; Williams-Ellis, C. (1919). The Tank Corps (online scan ed.). New York: G. H. Doran. OCLC317257337. Retrieved 29 March 2014 – via Archive Foundation. Perry, R. A. (2014). To Play a Giant's Part: The Role of the British Army at Passchendaele. Uckfield: Naval & Military Press. ISBN978-1-78331-146-0.
Perry 2014, p. 225; Williams-Ellis & Williams-Ellis 1919, p. 148. Perry, R. A. (2014). To Play a Giant's Part: The Role of the British Army at Passchendaele. Uckfield: Naval & Military Press. ISBN978-1-78331-146-0. Williams-Ellis, A.; Williams-Ellis, C. (1919). The Tank Corps (online scan ed.). New York: G. H. Doran. OCLC317257337. Retrieved 29 March 2014 – via Archive Foundation.
Williams-Ellis & Williams-Ellis 1919, p. 149; Perry 2014, p. 225. Williams-Ellis, A.; Williams-Ellis, C. (1919). The Tank Corps (online scan ed.). New York: G. H. Doran. OCLC317257337. Retrieved 29 March 2014 – via Archive Foundation. Perry, R. A. (2014). To Play a Giant's Part: The Role of the British Army at Passchendaele. Uckfield: Naval & Military Press. ISBN978-1-78331-146-0.