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Universitas Indonesia, 2013
UI - Skripsi (Membership)
Universitas Indonesia, 2002
UI - Skripsi (Membership)
Wittkopf, Eugene R., author
Thomson wadsworth, 2008
Buku Teks
Klein, John J., 1929-, author
Harcourt, Brace & World, 1965
Buku Teks
Heilbroner, Robert L., author
Vintage Books , 1963
Buku Teks