Roy, James A. Le
Houghton Mifflin, 1914.
Buku Teks
Rossi, Renzo, author
Macmillan, 1996
Buku Referensi
McCulloch, John I. B.
New York The Foreign Policy Association 1940
Buku Teks
Lee, Joann Faung Jean
New Press, 1991
Buku Teks
Hsu, Francis L.K., author
Cresset Press, 1955
Buku Teks