Morris, Richard B.
Van Nostrand Reinhold, 1955
Buku Teks
Arendt, Hannah, 1906-1975
Penguin, 1965
Buku Teks
Laski, Harold J.
George Allen and Unwin, 1946
Buku Teks
Brinton, Crane, 1898-1968
Prentice-Hall, 1952
Buku Teks
Laski, Harold J.
George Allen and Unwin, 1952
Buku Teks