edited by Keith and Helen Johnson
Blackwell, 1999
Buku Referensi
Hunston, Susan, author
Cambridge University Press,, 2006
Buku Teks
J. P. B. Allen and S. Pit Corder edited by
Oxford University, 1980
Buku Teks
editors, S.P. Corder, E. Roulet
AIMAV, 1974
Buku Teks
Ellis, Sue, editor
Cambridge University Press, 2011
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