edited by Robert D. Putnam
Oxford University Press, 2002
Buku Teks
Slater, Ralph P., author
Frederick A. Praeger, 1968
Buku Teks
Masatsugu, Mitsuyuki
Amacom, 1982
Buku Teks
Macdonald, Donald Stone
Westview Press, 1988
Buku Teks
Barnes, Harry Elmer, author
Prentice-Hall, 1950
Buku Teks