Cranston, Maurice, author
Bodley Head, 1973
Buku Teks
Evans, John Hyde, author
Oxford University Press, 2016
eBooks
Selby, David, author
Cambridge University Press, 1988
Buku Teks
edited by Ian Brownlie, Guy S. Goodwin-Gill
Clarendon Press, 1971
Buku Teks
Centre for Human Right, United Nations , 1991
Buku Teks