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The Viking Press, 1947
Buku Teks
Rabushka, Alvin
Hoover Institution, 1973
Buku Teks
Pasaribu, Ruth Vania Christine , author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Skripsi (Membership)
Sleeper, Jim
W.W.Norton, 1990
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Wade, Peter, author
Pluto Press, 2002
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