Chú thích Liên_minh_Trung_tâm

  1. 1 2 3 4 Roger Chickering, Imperial Germany and the Great War, 1914-1918, các trang 168-176.
  2. 1 2 Robert Cowley, Geoffrey Parker, The Reader's Companion to Military History, trang 274
  3. ↑ Spencer Tucker, Battles That Changed History: An Encyclopedia of World Conflict, các trang 442-443.
  4. ↑ William Kelleher Storey, The First World War: A Concise Global History, các trang 146-147.
  5. 1 2 3 Ashley Ekins, Ashley Elkins Ashley, 1918 - Year of Victory: The End of the Great War and the Shaping of History, các trang 166-168.