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