Robertson, Arthur Henry, 1913-
Manchester University Press, 1992
Buku Teks
Selby, David
Cambridge University Press, 1988
Buku Teks
Unesco, 1970
Buku Teks
Cassesse, Antonio
Yayasan Obor Indonesia , 1993-1994
Buku Teks
edited by Ian Brownlie, Guy S. Goodwin-Gill
Clarendon Press, 1971
Buku Teks