Fritzman, J. M.
Polity Press , 2014
Buku Teks
Cairns, Huntington, 1904-1985
Johns Hopkins Press, 1967
Buku Teks
Cairns, Huntington
The John Hopkins Press, 1949
Buku Teks
Stace, W. T.
Dover Publications, Inc., 1923
Buku Teks
Hegel, Georg Wilhelm Friedrich
Dover Publications, 1956
Buku Teks