Holder of the John Biggs Chair in Military History Spencer C.; Tucker, Spencer; Wood, Laura Matysek; Murphy, Justin D. The European Powers in the First
Robert M. The Kentucky State Constitution. New York: Oxford University Press. 2011: pp.63-64. ISBN 978-0-19-987781-2. 引文格式1维护:冗余文本 (link) Powers, James
2014). Duggan, John P. Herr Hempel at the German Legation in Dublin 1937–1945 (Irish Academic Press) 2003 ISBN 0-7165-2746-4 Fisk, Robert In time of War: