Maritain, Jacques
Man and the state
The University of Chicago Press, 1951
 Buku Teks
Laski, Harold J.
Liberty in the modern state
George Allen and Unwin, 1948
 Buku Teks
Laski, Harold J.
Liberty in the modern state
Penguin Books, 1937
 Buku Teks
Lindsay, A.D.
The modern democratic state
Oxford University Press, 1959
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Strong, C.F.
Modern political constitutions: an introduction to the comparative study of their history and existing forms
Sidgwick & Jackson Limited, 1960
 Buku Teks