Unesco, 1970
Buku Teks
Arie Afriansyah, author
University of Indonesia, Faculty of Law, 2011
Artikel Jurnal
edited by Alice H. Henkin
Aspen Institute for Humanistic Studies, 1979
Buku Teks
United Nations , 1987
Buku Teks
edited by Ian Brownlie, Guy S. Goodwin-Gill
Clarendon Press, 1971
Buku Teks