Peacock, H.L., author
Heinemann Educational Books, 1980
Buku Teks
Williamson, James A., author
Macmilan and Co,, 1950
Buku Teks
Holdsworth, William, Sir, author
Methuen, 1938
Buku Teks
Hanbury, Harold Grenville, author
Methuen, 1956
Buku Teks
Chesterton, G. K. (Gilbert Keith), 1874-1936, author
Chatto , 1951
Buku Teks