Spencer, J. E.
John Wiley & Sons, 1954
Buku Teks
Buruma, Ian
Vintage, 1991
Buku Teks
Whitmore, T.C., author
Oxford University Press, 1986
Buku Teks
Quigley, Harold S., author
World Peace Foundation, 1938
Buku Teks
East Asia Foudation, 2014
Majalah, Jurnal, Buletin