Hovenkamp, Herbert, author
West Publishing, 1993
Buku Teks
Gellhorn, Ernest, author
West , 1994
Buku Teks
Gellhorn, Ernest, author
St.paul Minn, 1986
Buku Teks
Thompson, Martin J., author
An Aspen , 1979
Buku Teks
Black, Oliver, 1957-, author
Cambridge University Press, 2005
Buku Teks