Adams, Kenneth A.
American Bar Association, 2008
Buku Teks
Chambers, Harold L.
Prentice-Hall, 1980
Buku Referensi
Hasanuddin Rahman
Citra Aditya Bakti, 2003
Buku Teks
The University of Chicago Press, 2010
Buku Teks
University of Chicago Press, 1993
Buku Teks