Taper, Bernard, author
McGraw-Hill, 1962
Buku Teks
Lomax, Louis E
Harper & Brothers Publishers, 1962
Buku Teks
Konvitz, Milton R.
Columbia University Press, 1962
Buku Teks
McPherson, James M.
Princeton University press, 1977
Buku Teks
Routledge, 1996
Buku Teks