Little, Brown , 1970
Buku Teks
Banfield, Edward C., author
Random House, 1967
Buku Teks
Greene, Thomas H., author
Prentice-Hall, 1984
Buku Teks
Hague, Rod., author
Palgrave Macmillan , 2013
Buku Teks
edited by Nimrod Raphaeli
Allyn and Bacon, 1967
Buku Teks