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Buku Teks
Wittkopf, Eugene R., author
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Buku Teks
Tiller, R. Mark, author
St. Martin's Press , 1997
Buku Teks
Eugene R. Wittkopf, James M. McCormick, editor
Rowman & Littlefield publisher INC, 2008
Buku Teks
Catharine Chelsea Patricia, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2017
UI - Tugas Akhir