Corwin, Edward S.
New York University Press, 1956
Buku Teks
Pious, Richard M.
Basic Books, 1944
Buku Teks
Rossiter, Clinton, 1917-1970
American Library Association, 1960
Buku Teks SO
Longaker, Richard P.
Cornell University Press, 1962
Buku Teks
Scigliano, Robert
Free Press, 1971
Buku Teks