Oxford University Press, 2003
Buku Teks
Cini, Michelle
Oxford Univesity Press, 2010
Buku Teks
Yvonne Galligan.
Routledge, 2015
Buku Teks
Jupille, Joseph Henri
Cambridge University Press, 2004
Buku Teks
edited by Susan Baker ... [et al.]
Routledge, 1997
Buku Teks