Metcalf, O. R. (1976). British defence policy, strategy, and diplomacy, 1931-1936. University of Cambridge.
Lua i Stíl Chicago (17ú heag.)Metcalf, Oliver Railton. British Defence Policy, Strategy, and Diplomacy, 1931-1936. University of Cambridge, 1976.
Lua MLA (8ú heag.)Metcalf, Oliver Railton. British Defence Policy, Strategy, and Diplomacy, 1931-1936. University of Cambridge, 1976.
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