Innes, Martin
Oxford Univesity Press, 2014
Buku Teks
Roger Matthews, editor
Routledge, 2001
Buku Teks
Clarke, Michael
St.Martin`s Press, 1990
Buku Teks
Boston, Nigel, author
[Springer, ], 2012
eBooks
Simpson, Sally S.
Cambridge University Press, 2002
Buku Teks