International Society for Educational Information, 1989
Buku Teks
[date of publication not identified]
Buku Teks
Forbis, William H.
Charles E.Tuttle, 1981
Buku Teks
Sansom, George Bailey, Sir, 1883-1965, author
Stanford University Press, 1958
Buku Teks
Seiroka, Noma, author
Kodansha International, 1970
Buku Referensi