Vansittart, R. G. (1945). The German octopus. London: Hutchinson & Co.
Lua i Stíl Chicago (17ú heag.)Vansittart, Robert Gilbert. The German Octopus. London: Hutchinson & Co, 1945.
Lua MLA (8ú heag.)Vansittart, Robert Gilbert. The German Octopus. London: Hutchinson & Co, 1945.
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