Thompson, J.M., author
Basil Blackwell, 1955.
Buku Teks
Carlyle, Thomas, author
E.P. Dutton, 1955
Buku Teks
Salvemini, Gaetano
W.W. Norton & Company, 1962
Buku Teks
Gershoy, Leo, author
Appleton Century Crofts, 1938
Buku Teks
Doyle, William, author
Oxford University Press , 1989
Buku Teks