Stelzer, Irwin M
Richard D. Irwin, 1986
Buku Teks
Calkins, Richard M.
Dow Jones-Irwin, 1981
Buku Teks
Hovenkamp, Herbert
West Publishing, 1993
Buku Teks
American Bar Association, 1975
Buku Teks
Posner, Richard A.
The University of Chicago, 1976
Buku Teks