edited by Vergilius Ferm
Littlefield, Adams & Co., 1961
Buku Teks
Taylor, Paul C., author
Polity Press, 2013
Buku Teks
The Korea Development Institute, 1998
Buku Teks
edited by Joel Feinberg, Hyman Gross
Wadsworth, 1977
Buku Teks
Plekhanov, G.
Foreign Languages Publishing House , [date of publication not identified]
Buku Teks