Maritain, Jacques
The University of Chicago Press, 1951
Buku Teks
Laski, Harold J.
George Allen and Unwin, 1948
Buku Teks
Laski, Harold J.
Penguin Books, 1937
Buku Teks
Lindsay, A.D.
Oxford University Press, 1959
Buku Teks
Strong, C.F.
Sidgwick & Jackson Limited, 1960
Buku Teks