Devine, Fiona, author
Cambridge University Press, 2004
Buku Teks
Goodstein, Eban S., author
Island Press, 1999
Buku Teks
Brown, David, author
Macmillan, 1978
Buku Teks
McNair, Brian, author
A Member of the Hodder Headline Group, 1998
Buku Teks
Preston, Andrew, author
Oxford University Press, 2017
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