edited by Robert E. Ward
Princeton University Press, 1968
Buku Teks
Ward, Robert E., author
Prentice-Hall, 1978
Buku Teks
Ward, Robert E., author
Prentice-Hall, 1967
Buku Teks
Calder, Kent
Princeton University press, 1986
Buku Teks
Reischauer, Edwin O., author
G. Duckworth, 1964
Buku Teks