Dulles, John Foster
Macmillan Company, 1950
Buku Teks
Schweitzer, Albert, author
Henry Holt, 1958
Buku Teks
Ziegler, David M., author
Little, Brown, 1981
Buku Teks
Ziegler, David M., author
Little, Brown, 1981
Buku Teks
Columbia University Press, 2013
Buku Teks