edited by John Caldwell, Edward Olleson and Susan Wollenberg
Oxford University Press, 1990
Buku Teks
Corcoran, Neil, author
Longman, 1993
Buku Teks
Robinson, Alan, author
Macmillan, 1988
Buku Teks
Cooper, John Xiros, author
Cambridge University Press, 2009
eBooks
Sitter, John, author
Cambridge University Press, 2011
eBooks