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Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2004
UI - Skripsi Membership
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Philosophical Library, 1948
Buku Teks SO
Toynbee, Arnold J.
Oxford University Press, 1976
Buku Teks
Gore, Charles
J.M. Dent & Sons Ltd, 1935
Buku Teks SO
Vos, H. de
G.F. Callenbach, 1966
Buku Teks