Mitchell, Rosamond, author
Arnold, 1998
Buku Teks
Donald Freeman and Jack C. Richardsand , author
Cambridge Cambridge University Press 1996
Buku Teks
Cambridge University Press, 2004
Buku Teks
Mitchell, Rosamond, author
Routledge, 2004
Buku Teks
Dickinson, Leslie, author
Cambridge University Press , 1987
Buku Teks