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  1. ↑ Marc Ferro, The Great War, 1914-1918, trang 72
  2. ↑ Robert A. Doughty, Pyrrhic victory: French strategy and operations in the Great War, trang 512
  3. 1 2 Lawrence Sondhaus, World War One: The Global Revolution, trang 145
  4. 1 2 3 4 5 6 7 8 9 10 Spencer Tucker, Laura Matysek Wood, The European powers in the First World War: an encyclopedia, trang 183
  5. 1 2 3 Spencer Tucker, Priscilla Mary Roberts, World War I: encyclopedia, Tập 1, trang 285
  6. ↑ David F. Burg, L. Edward Purcell, Almanac of World War I, các trang 88-89.
  7. ↑ Robert A. Doughty, Pyrrhic victory: French strategy and operations in the Great War, các trang 190-191.
  8. 1 2 3 4 Priscilla Mary Roberts, World War I: A Student Encyclopedia, các trang 1922-1925.
  9. ↑ Priscilla Mary Roberts, World War I: A Student Encyclopedia, trnag 785
  10. ↑ Priscilla Mary Roberts, World War I: A Student Encyclopedia, trang 2151

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