Johnson, Gerald W.
William Morrow and Company, 1962
Buku Teks
Baum, lawrence
A Division of Congressional Quarterly Inc, 1989
Buku Teks
Bickel, Alexander M.
Harper Torchbooks, 1970
Buku Teks
Woodward, Bob
Simon and Schuster, 1979
Buku Teks
Bickel, Alexander M.
Harper & Row, 1970
Buku Teks