Niebuhr, R. (1959). Nations and empires: Recurring patterns in the political order. Faber and Faber.
Chicago-čujuhus (17. p.)Niebuhr, Reinhold. Nations and Empires: Recurring Patterns in the Political Order. Londres: Faber and Faber, 1959.
MLA-čujuhus (9. p.)Niebuhr, Reinhold. Nations and Empires: Recurring Patterns in the Political Order. Faber and Faber, 1959.
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