Butterfield, Herbert, author
Cambridge University Press, 1955
Buku Teks
Simpson, W.O.
Stanley Thornes, 1988
Buku Teks
Finley, M. I.
Penguin Books, 1975
Buku Teks
Tosh, John, author
Longman , 1991
Buku Teks
Soedjatmoko, 1922-1989, author
Cornell University Press, 1960
Buku Teks