Betz, Nancy E.
Academic Press, 1987
Buku Teks
Hammitt, William E.
John Wiley & Sons, 1987
Buku Teks
Constitutional Convention Committee, 1938
Buku Teks
Wise, David
Random House , 1964
Buku Teks
Moulton, Harold G., author
University of Chicago Press, 1922
Buku Teks