Holt, Rinehart and Winston,, 1977
Buku Teks
edited by Peter Brooker and Andrew Thacker
Routledge, 2005
Buku Teks
Bell, Michael, author
Cambridge University Press, 2009
eBooks
Williams, Louise Blakeney, author
Cambridge University Press, 2009
eBooks
Butler, Christopher, author
Oxford University Press, 1994
Buku Teks