Lichtheim, G. (1971). Imperialism. New York: Allen Lane The Penguin Press.
Trích dẫn kiểu ChicagoLichtheim, George. Imperialism. New York: Allen Lane The Penguin Press, 1971.
Deismireacht MLALichtheim, George. Imperialism. New York: Allen Lane The Penguin Press, 1971.
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