Gutteridge, H. C.
Cambridge University Press, 1949
Buku Teks
Whelan, Jennifer, author
Faculty of Law University of Indonesia, 2016
Artikel Jurnal
Fletcher, George P., author
Oxford University Press, 1996
Buku Teks
Kelsen, Hans, author
Clarendon Press Oxford, 1992
Buku Teks
Dowling, Noel T., author
Foundation Press, 1952
Buku Teks