Stamps, Norman L.
University of Notre Dame Press, 1957
Buku Teks
Omar, Imtiaz, author
Kluwer Law International, 1996
Buku Teks
Ostrom, Vincent, author
University of Michigan Press, 1997
Buku Teks
Barbu, Zevedei, author
Routledge , 1965
Buku Teks
Fisher, Louis, author
Oxford University Press, 2014
Buku Teks