Flinn, M.W., author
Longman, 1969
Buku Teks
Smith, Thomas C., author
Standford University Press, 1959
Buku Teks
Smith, Thomas C., author
Standford University Press, 1965
Buku Teks
Zeitlin, Irving M., author
Polity Press, 2007
Buku Teks
Trevor-Roper, H.R.
New York Harper & Row 1957
Buku Teks