edited by A.T. Dalfovo
Council for Research in Values and Philosophy, 2002
Buku Teks SO
Selby, David
Cambridge University Press, 1988
Buku Teks
Unesco, 1970
Buku Teks SO
United Nations , 1987
Buku Teks SO
edited by Ian Brownlie, Guy S. Goodwin-Gill
Clarendon Press, 1971
Buku Teks SO