Meyer, Robert R.
Twayne's, 1966
Buku Teks
Musolf, Lloyd D.
Scott, Foresman and Company, 1965
Buku Teks
Toynbee, Arnold J.
Oxford University Press, 1958
Buku Teks
Roma : Istituto Iataliano per IlMedio ed Estremo Oriente
Majalah, Jurnal, Buletin
Patter, Robert B.
Longman, 1998
Buku Teks