Elkins, Arthur, author
Addison-Wesley, 1975
Buku Teks
M.A. Neave
The Law Book Company Limited, 1977
Buku Teks
Hardingham, I.J., author
Law Book Company, 1977
Buku Teks
Fenno, Richard F.
Harvard University Press, 1959
Buku Teks
Richard J. Goy
Phaidon, 2002
Buku Teks