Middlebrook, M. (1983). The Kaiser's Battle, 21 March 1918 - the first day of the German Spring Offensive. Middlesex: Penguin Books.
Chicago-referens (17:e uppl.)Middlebrook, Martin. The Kaiser's Battle, 21 March 1918 - the First Day of the German Spring Offensive. Middlesex: Penguin Books, 1983.
MLA-referens (8:e uppl.)Middlebrook, Martin. The Kaiser's Battle, 21 March 1918 - the First Day of the German Spring Offensive. Middlesex: Penguin Books, 1983.
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