Bemis, Samuel Flagg, 1891-1973, author
Harcourt, Brace, 1943
Buku Teks
Westview Press, 1980
Buku Teks
Stuart, Graham H. (Graham Henry), 1887-, author
Appleton-Century-Crofts, 1955
Buku Teks
Beard, Charles A., author
Macmillan, 1957
Buku Teks
Mayer, Thomas, author
Random House, 1968
Buku Teks