Houghton, John W.
Westview Press , 1991
Buku Teks
Robbins, Lionel, editor
Macmilan Co., 1936
Buku Teks
Mann, F.A.
Humphrey Milford Oxford University Press , 1938
Buku Teks
Rowse, A.L. (Alfred Leslie), 1903-1997
The British Council, 1943
Buku Teks
Holdsworth, William, Sir
Methuen, 1938
Buku Teks