Cranston, Maurice
The Bodley Head, 1973
Buku Teks
RisperGraf C. A.,
Majalah, Jurnal, Buletin
edited by A.H. Robertson
Manchester University Press, 1968
Buku Teks
Paul L.C. Torremans, editor
Kluwer Law International, 2008
Buku Teks
Smith, Rhona K., author
Routledge, 2010
Buku Teks