Pike, Fredrick B.
University of Notre Dame Press, 1963
Buku Teks
United States Information Agency, 1987
Buku Teks
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