Friedman, Lawrence M., 1930-, author
Tatanusa, 2001
Buku Teks
Corwin, Edward S., author
Great Seal Books, 1955
Buku Teks
Pole, J.R., author
University of California Press, 1993
Buku Teks
Pritchett, C. Herman, author
McGraw-Hill, 1981
Buku Teks
Tribe, Laurence H., author
Foundation Press, 1979
Buku Teks