Cassinelli, C.W.
The politics of freedom: an analysis of the modern democratic state
University of Washington Press , 1961
 Buku Teks SO
Simon, Yves R.
Philosophy of democratic government / Yves R. Simon
The University of Chicago Press, 1951
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MacIver, Robert M.
The modern state
Oxford, 1926
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Laski, Harold J.
Liberty in the modern state
George Allen and Unwin, 1948
 Buku Teks SO
Laski, Harold J.
Liberty in the modern state
Penguin Books, 1937
 Buku Teks SO