Thompson, J.M., author
Basil Blackwell, 1955.
Buku Teks
Roberts, J.M.
Oxford University Press , 1978
Buku Teks
Carlyle, Thomas, author
E.P. Dutton, 1955
Buku Teks
Nash, Gary B., author
Harvard University Press, 1979
Buku Teks
Burke, Peter, author
Stanford University Press, 1990
Buku Teks