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Berlitz Publishing, 1993
Buku Teks
Bauer, Lauria
London : Routledge, 1998
Buku Teks
Morgan, John, 1944-2004, author
Oxford University Press, 1990
Buku Teks
Kawakita, Kyoko, author
Graduate School of Language and Culture, Osaka University, 2019
Artikel Jurnal
Rousset, Camille
London Hachette 1892
Buku Teks