Stephen Ross, editor
Routledge, 2009
Buku Teks
edited by Michael H. Whitworth
Blackwell, 2007
Buku Teks
Butler, Christopher
Oxford University Press, 1994
Buku Teks
Holt, Rinehart and Winston,, 1977
Buku Teks
Williams, Louise Blakeney
Cambridge University Press, 2009
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