Pfaltzgraff, R. L. (1969). Politics and the international system. Lippincott.
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Tohutoru Kātū Chicago (17th ed.)
Pfaltzgraff, Robert L. Politics and the International System. Philadelphia: Lippincott, 1969.
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Tohutoro MLA (9th ed.)
Pfaltzgraff, Robert L. Politics and the International System. Lippincott, 1969.
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