edited by Peter Duus
Cambridge University Press, 1995
Buku Referensi
Gooch, G.P.
Beacon Press, 1968
Buku Teks
edited by Clement Semmler
Oxford University Press, 1967
Buku Teks
Gale Research Company, 1988/1989
Buku Referensi
Habib, M.A.R.
Blackwell, 2008
Buku Teks