Ward, Robert E.
Prentice-Hall, 1978
Buku Teks
Ward, Robert E.
Prentice-Hall, 1967
Buku Teks
Calder, Kent
Princeton University press, 1986
Buku Teks
Reischauer, Edwin O.
G. Duckworth, 1964
Buku Teks
Quigley, Harold S.
University of Minnesota Press, 1956
Buku Teks