Hobson, J. A. (1938). Imperialism: A study. G. Allen & Unwin ltd.
Lua i Stíl Chicago (17ú heag.)Hobson, John Atkinson. Imperialism: A Study. London: G. Allen & Unwin ltd, 1938.
Lua MLA (9ú heag.)Hobson, John Atkinson. Imperialism: A Study. G. Allen & Unwin ltd, 1938.
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