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Foreign Languages Publishing House, 1920
Buku Teks
Anderson, Chris
Headline Publishing Group, 2016
Buku Teks
Houston, Brant
St. Martin Press, 1996
Buku Referensi
Arnold, Alvin L.
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Buku Teks
Black, Geoff
London : Prentice Hall, 2001,
Buku Referensi