Little, Brown , 1970
Buku Teks
edited by Gabriel A. Almond, James S. Coleman
Princeton University Press, 1960
Buku Teks
Westview Press , 1985
Buku Teks
Maitland-Jones, J.F., author
W.W. Norton, 1974
Buku Teks
Mayer, Lawrence C.
John Wiley & Sons, 1977
Buku Teks