edited by, Alan D. Burnett and Peter J. Taylor
John Wiley & Sons, 1981
Buku Teks
edited by L.F. Rushbrook Williams
Octagon Press, 1973
Buku Teks
Williams, Ethel L.
Scholarly Resources Press, 1977
Buku Referensi
Foreign Area Studies The American University, 1983
Buku Teks
Prentice-Hall, 1965
Buku Teks