Fincher, E. B., author
Abelard-Schuman, 1955
Buku Teks
Reischauer, Edwin O., author
Harvard University Press, 1950
Buku Teks
Risjord, Norman K., author
Prentice-Hall, 1985
Buku Teks
Williams, T. Harry, author
Alfred A. Knopf, 1963
Buku Teks
Beard, Charles A., author
New Home Library, 1944
Buku Teks