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Cambridge Cambridge University Press 1974,
Buku Teks
Ackley, Gardner, author
Jakarta Yayasan Penerbit Universitas Indonesia 1973,
Buku Teks
Victoria : Brown Prior Anderson
Majalah, Jurnal, Buletin
Morishima, Michio
Oxford Clarendon Press 1969,
Buku Teks
Keat, Paul G., author
Pearson Education (Prentice Hall), 2009
Buku Teks