Summers, Della
Pearson Education Limited, 2010
Multimedia
Morris, Edward E., author
Sydney University Press, 1972
Buku Referensi
Wehr, Hans, 1909-1981, author
Spoken Language Services, 1976
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Lanyon-Orgill, Peter A., author
Luzac & Co., 1944
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Steingass, F., author
Antarkarya, 1986
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