Crowley, Tony
Routledge, 1996
Buku Teks SO
Vinokur, Grigori Osipovich, 1896-1947
Cambrigde University Press , 2010
Buku Teks SO
Noriko Takada
Macmillan, 1995
Buku Teks SO
Alfonso, Anthony
Sophia University LL Center of Applied Linguistics, 1980
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Miller, Roy Andrew
University Press, 1967
Buku Teks SO