Jones, Bill, author
Manchester University Press, 1991
Buku Teks
Jones, Bill, author
Manchester University Press, 1990
Buku Teks
Jones, Bill, author
Manchester University Press, 1993
Buku Teks
Pye, Keith
Stanley Thornes , 1992
Buku Teks
Beer, Samuel H., author
Alfred A. Knopf, 1966
Buku Teks