Blake, N. M., & Barck, O. T. (1960). The United States in its world relations. New York: Mc Graw-Hill.
Παραπομπή Chicago StyleBlake, Nelson Manfred, and Oscar Theodore Barck. The United States in Its World Relations. New York: Mc Graw-Hill, 1960.
Παραπομπή MLABlake, Nelson Manfred, and Oscar Theodore Barck. The United States in Its World Relations. New York: Mc Graw-Hill, 1960.
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