MacIver, Robert M., author
Oxford, 1926
Buku Teks
Harvard Business School Press, 1991
Buku Teks
Badie, Bertrand, author
University of Chicago Press, 1983
Buku Teks
edited by Don K. Price
Prentice-Hall, 1960
Buku Teks
Maritain, Jacques
The University of Chicago Press, 1951
Buku Teks