Stanford, Michael
Blackwell Publishers, 1998
Buku Teks
Toynbee, Arnold J., author
Oxford University Press , 1957
Buku Teks
Christopher, Dawson, author
Catholic University of America Press, 20001
Buku Teks
Hegel,G.W.F
The Boss-Merrill Company, INC, 1953
Buku Teks
Dray, William H.
Prentice-Hall, 1993
Buku Teks