Ken-Ichi Kawakatsu
Japan Travel Bureau, 1960
Buku Teks
Tobin, Allan J.
Harcourt College Publishing, 2001
Buku Teks
Burton R. Clark, Guy R. Neave, editors-in-cheif
Pergamon Press, 1992
Buku Referensi
Crest Publishing House, 1998,
Buku Referensi
editors, George S. Bridgges, Joseph G. Weis, Robert D. Crutchfield
Pine Force Press, 1996
Buku Teks