Dahl, Robert A., 1915-2014
Prentice-Hall, 1978
Buku Teks
Lasswell, Harold D.
Routledge & Kegan Paul, 1952
Buku Teks
edited by Michael Banton
Tavistock Publications, 1972
Buku Teks
Univ of Pittsburh Press, 1991
Buku Teks
Joad, C.E.M.
Clarendon Press, 1959
Buku Teks