Rainey, Bernadette, author
Oxford University Press, 2012
Buku Teks
Wedderburn, Lord
Penguin Books, 1986
Buku Teks
Harte, J.D.C.
E & F.N. Spon , 1985
Buku Teks
Mason, Peter, author
Routledge, 1998
Buku Teks
Griffith, Richard, author
Learning matters Ltd., 2008
Buku Teks