Brooks, Brian S., author
St. Martin`s Press, 1993
Buku Teks
Bloomsbury Books, 1991
Buku Referensi
Palmer, Alan, author
Penguin Books, 1981
Buku Referensi
Palmer, Alan, author
Penguin Books , 1987
Buku Referensi
Williams, E.N., author
Allen Lane, 1980
Buku Referensi