Schenkman Publishing company, 1974
Buku Teks
Unesco, 1970
Buku Teks
Dijk, P. Van
Kluwer Law & Taxation Publishers, 1990
Buku Teks
Selby, David, author
Cambridge University Press, 1988
Buku Teks
edited by Ian Brownlie, Guy S. Goodwin-Gill
Clarendon Press, 1971
Buku Teks