editor, Madan G. Singh
Pergamon Press, 1987
Buku Referensi
Gibbon, Edward
Random House, 1994
Buku Referensi
Hemmerechts, Kristien
Atlas, 2004
Buku Teks
Willardson, Robert K.
Reinhold Pub. Co., 1962
Buku Teks
Kokusai Bunka Shinkokai, 1964
Buku Referensi