History of the Second World War. Penguin Books Limited. pp. 173–. ISBN 978-0-14-193886-8. Terence Zuber (31 October 2002). Inventing the Schlieffen Plan: German...
History of the Second World War. Penguin Books Limited. p. 501. ISBN 978-0-14-193886-8. Schlesinger, Arthur Jr. (1992), "The London Operation: Recollections...