Hardt, J. P. (1961). The cold war economic gap: The increasing threat to American supremacy. Praeger.
Lua i Stíl Chicago (17ú heag.)Hardt, John Pearce. The Cold War Economic Gap: The Increasing Threat to American Supremacy. New York: Praeger, 1961.
Lua MLA (9ú heag.)Hardt, John Pearce. The Cold War Economic Gap: The Increasing Threat to American Supremacy. Praeger, 1961.
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