Manchester University Press , 1995
Buku Teks
Groves, Peter
Cavendish Publishing, 1994
Buku Teks
George, Stephen, author
Oxford University Press, 1985
Buku Teks
Daltrop, Anne, author
Longman, 1982
Buku Teks
Nicoll, William, author
Harvester Wheatsheaf, 1994
Buku Teks