Latourette, Kenneth Scott, author
Macmillan, 1951
Buku Teks
Dallin, David
Hollis & Carter, 1949
Buku Teks
Europe Publications Limited, 1992
Buku Referensi
Thompson, Warren S., author
The University of Chicago Press, 1959
Buku Teks
Peterson, A.D.C., author
Gerald Duckworth, 1949
Buku Teks