Hawgood, John A.
Macmillan and co., limited, 1939
Buku Teks
edited by Eivind Smith
Kluwer Law International, 1995
Buku Teks
Maddex, Robert L.
Routledge, 1996
Buku Teks
edited by V.A.C. Gatrell, Bruce Lenman, and Geoffrey Parker
Europa Publications, 1980
Buku Referensi
Barnes & Noble, 1955
Buku Referensi