Eskridge, William N.
St. Paul Minn, 1988
Buku Teks
Merges, Robert Patrick, author
Michie, 1997
Buku Teks
Malin, Martin H., author
Thomson/West, 2011
Buku Teks
Le Sueur, A.P. (Andrew P.), author
Oxford University Press, 2013
Buku Teks
Leslie, Douglas L., author
Little, Brown and Company, 1981
Buku Teks