Cochran, Thomas C., author
Macmillan, 1947
Buku Teks
Johnson, Daniel Milo, author
Duke University Press, 1981
Buku Teks
Wright, Gwendolyn, author
MIT Press, 2001
Buku Teks
Palmer, R.R. (Robert Roswell), 1909-2002, author
Princeton University Press, 1964
Buku Teks
Trevelyan, George Macaulay, 1876-1962, author
Longmans, Green, 1950
Buku Teks