Oxford University Press, 1993
Buku Teks
Steiner, Josephine, author
Blackstone Press, 1998
Buku Teks
Blanco, Luis Ortiz
Clarendon Press, 1996
Buku Teks
Shaw, Josephine, author
Macmillan, 1993
Buku Teks
Arnull, Anthony
Leicester University Press, 1990
Buku Teks