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Oxford University Press, 1990
Buku Teks SO
Stewart, James, 1941-
Brooks/Cole, 2005
Multimedia
Kachru, Yamuna
Routledge, 2008
Buku Teks SO
Tubbs, Stewart L.
McGraw-Hill, 2008
Buku Teks SO
Parret, Herman
John Benjamin B.V. , 1980
Buku Teks SO