Cairns, Huntington
The John Hopkins Press, 1949
Buku Teks
Flew, Antony
Thames and Hudson , 1989
Buku Teks
Stace, W. T.
Dover Publications, Inc., 1923
Buku Teks
Hegel, Georg Wilhelm Friedrich
Dover Publications, 1956
Buku Teks
Fritzman, J. M.
Polity Press , 2014
Buku Teks