Williamson, G.
Longmans, 1959
Buku Teks
Cairncross, Sandy, author
John Wiley & Sons, 1993
Buku Teks
Santayana, George, author
Dover, 1955
Buku Teks
Orwell, George, 1903-1950, author
Everyman's Library, 1993
Buku Teks
Ridley, Mark, author
Blackwell, 1995
Buku Teks