MacIver, Robert M., author
Oxford, 1926
Buku Teks
Maritain, Jacques
The University of Chicago Press, 1951
Buku Teks
Laski, Harold J., author
George Allen and Unwin, 1948
Buku Teks
Laski, Harold J., author
Penguin Books, 1937
Buku Teks
Lindsay, A.D., author
Oxford University Press, 1959
Buku Teks