Mill, John Stuart
A Meridian Book, 1962
Buku Teks
Charles W. Eliot, edited
P. F. Collier & Son Corporation, 1959
Buku Referensi
Everett, Charles W., author
Emile Durkheim, 1966
Buku Teks
Postema, Gerald J., author
Clarendon Press, 1986
Buku Teks
Ogden, C. K. (Charles Kay), 1889-1957, author
Littlefield, 1959
Buku Teks