Penrose, E. F. (1965). The revolution in international relations: A study in the changing nature and balance of power. Cass.
Lua i Stíl Chicago (17ú heag.)Penrose, Ernest Francis. The Revolution in International Relations: A Study in the Changing Nature and Balance of Power. [London]: Cass, 1965.
Lua MLA (9ú heag.)Penrose, Ernest Francis. The Revolution in International Relations: A Study in the Changing Nature and Balance of Power. Cass, 1965.
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