Tuchman, Barbara W., author
Macmillan, 1965
Buku Teks
Jackson, J. Hampden
Hougton Mifflin Company, 1956
Buku Teks
Barraclough, Geoffrey, 1908-1984
Penguin Books, 1967
Buku Teks
Wachters, H.J.J.
AD.M.C. Stok, [date of publication not identified]
Buku Teks
Keylor, William R., 1944-
Oxford University Press, 1996
Buku Teks