Hegel,G.W.F
The Boss-Merrill Company, INC, 1953
Buku Teks
Dray, William H.
Prentice-Hall, 1993
Buku Teks
Jaspers, Karl
Routledge & Kegan Paul LTD., 1949
Buku Teks
Jaspers, Karl,
Routledge and Kegan Paul, 1953
Buku Teks
Nakamura, Hajime, author
Kodansha, 1975
Buku Teks