Grey, David L., author
North Western University Press, 1968
Buku Teks
Devol, Kenneth S., author
Hastings house Publisher, 1971
Buku Teks
Baum, lawrence
A Division of Congressional Quarterly Inc, 1989
Buku Teks
Bickel, Alexander M., author
Harper & Row, 1970
Buku Teks
Bickel, Alexander M., author
Harper Torchbooks, 1970
Buku Teks