Yamamoto Tadashi, Kim Gould Ashizawa
Japan Center for International Exchange, 2001
Buku Teks
Holt, Rinehart and Winston, 1985
Buku Teks
Hamner, Tommie
Prentice-Hall, 1990
Buku Teks
edited by Robert D. Putnam
Oxford University Press, 2002
Buku Teks
Slater, Ralph P., author
Frederick A. Praeger, 1968
Buku Teks